If the net external force acting on a system of bodies is zero, then the momentum of the system remains the same. The correct option is C
What is law of conservation of momentum ?The law of conservation of momentum, which states that the overall momentum of an isolated system remains constant in the absence of external forces, is a fundamental principle of physics.
Therefore, If the net external force acting on a system of bodies is zero, then the momentum of the system remains the same
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if the average temperature of the sun increased, the wavelength of peak solar emission would
If the average temperature of the sun increased, the wavelength of peak solar emission would decrease. This is because the peak wavelength of radiation emitted by an object is inversely proportional to its temperature, as described by Wien's Law.
Wien's Law states that the wavelength of the peak emission from a blackbody radiator is given by λ_max = b/T, where λ_max is the wavelength of maximum emission, T is the temperature of the radiator, and b is a constant known as Wien's displacement constant. As the temperature of the sun increases, the value of T in this equation increases, and therefore the value of λ_max decreases.
Thus, if the temperature of the sun were to increase, the peak of solar emission would shift to shorter wavelengths, which would increase the amount of high-energy radiation emitted by the sun. This would have important implications for the Earth's climate and could increase the risk of harmful effects of radiation, such as skin cancer and damage to satellite electronics.
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at what distance above the surface of the earth is the acceleration due to the earth's gravity 0.625 m/s2 if the acceleration due to gravity at the surface has magnitude 9.80 m/s2?
The distance above the surface of the Earth where the acceleration due to gravity is 0.625 m/s² is approximately 3.22 x 10^6 meters.
The acceleration due to Earth's gravity can be calculated using the formula:
g = GM/R²
where g is the acceleration due to gravity, G is the gravitational constant (6.674 x 10^-11 Nm²/kg²), M is the Earth's mass (5.972 x 10^24 kg), and R is the distance from the center of the Earth.
Given that the acceleration due to gravity at the surface (g_s) is 9.80 m/s², we can determine the Earth's radius (R_s) by rearranging the formula:
R_s = √(GM/g_s)
Now we need to find the distance (R) from the center of the Earth where the acceleration due to gravity is 0.625 m/s² (g_new). Using the same formula:
g_new = GM/R²
R = √(GM/g_new)
To find the distance above the surface of the Earth (h), subtract the Earth's radius from the new distance:
h = R - R_s
After plugging in the given values and solving, you will find that the distance above the surface of the Earth where the acceleration due to gravity is 0.625 m/s² is approximately 3.22 x 10^6 meters.
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Hold a spoon in a stream of water. Describe and explain the effect in terms of the differences of pressure.
When a spoon is held in a stream of water, the water flow creates a lower pressure region above the curved part of the spoon, which results in a net upward force called the lift force. The flow of water is faster over the curved surface of the spoon and slower beneath it. According to Bernoulli's principle, the pressure of a fluid decreases as its velocity increases, and vice versa.
Thus, as the water flows over the curved surface of the spoon, the velocity of the water increases and its pressure decreases. Meanwhile, the water beneath the spoon is moving more slowly, so its pressure is higher. This creates a pressure difference, with higher pressure beneath the spoon and lower pressure above the spoon, resulting in a net upward force.
This principle is also responsible for the lift force generated by an airplane wing, where the shape of the wing is designed to create a pressure difference that generates lift as air flows over it.
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two masses, m1 and m2, are moving with velocities and when they collide. after the collision, the final velocities are and. which of the following expressions is true? (the subscripts x and y represent the components along x and y respectively.)
Answer:
The only expression that is true is m
1
v
1x
+m
2
v
2x
=m
1
v
1x
′
+m
2
v
2x
′
. This is because the total momentum of the system must be conserved in a collision. The total momentum of the system is the sum of the momenta of the individual objects. In this case, the total momentum of the system is m
1
v
1x
+m
2
v
2x
before the collision and m
1
v
1x
′
+m
2
v
2x
′
after the collision. Since the total momentum of the system must be conserved, we have the following equation:
m
1
v
1x
+m
2
v
2x
=m
1
v
1x
′
+m
2
v
2x
′
The other expressions are not true because they do not conserve momentum. For example, the expression m
1
v
1y
+m
2
v
2y
=m
1
v
1y
′
+m
2
v
2y
′
is not true because it does not account for the momentum in the x-direction. The expression m
1
v
1x
=m
1
v
1x
′
is also not true because it does not account for the momentum of the second object.
Explanation:
resonance occurs when a 200-hz tuning fork encounters a sound wave with a frequency of
Resonance occurs when a vibrating system is exposed to an external force that has the same natural frequency as the system. In this case, the 200 Hz tuning fork will resonate when it encounters a sound wave with a frequency of 200 Hz, or a multiple of 200 Hz (400 Hz, 600 Hz, etc.). At these frequencies, the sound wave will cause the tuning fork to vibrate with a larger amplitude, as energy is transferred from the sound wave to the tuning fork.
If the sound wave has a frequency that is not a multiple of 200 Hz, then the tuning fork will not resonate and there will be no transfer of energy between the sound wave and the tuning fork. Instead, the sound wave will simply pass by the tuning fork without any significant effect.
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for a fixed sample size, the lower we set α, the higher is the ___________.
For a fixed sample size, the lower we set α, the higher is the Type II error.
Type I and Type II errors are the two types of errors that can occur in hypothesis testing. Type I error occurs when we reject a true null hypothesis, while Type II error occurs when we fail to reject a false null hypothesis.
The level of significance α is the probability of making a Type I error. When we lower the level of significance α, we decrease the probability of making a Type I error, but we increase the probability of making a Type II error. This is because as we make it more difficult to reject the null hypothesis (by lowering α), we increase the likelihood of failing to reject it even when it is false (which is a Type II error).
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suppose you have a 59.0-kg wooden crate resting on a wood floor. what maximum force can you exert horizontally on the crate without moving it?
The maximum force that can be exerted horizontally on the crate without moving it is approximately 289.4 N.
The maximum force that can be exerted horizontally on the crate without moving it is equal to the maximum static friction force between the crate and the wood floor. This force can be calculated using the equation:
f_max = μ_s * N
where μ_s is the coefficient of static friction between the two surfaces, and N is the normal force acting on the crate due to gravity.
Assuming that the coefficient of static friction between wood and wood is around 0.5, we can calculate the maximum force as follows:
f_max = μ_s * N
= 0.5 * m * g
= 0.5 * 59.0 kg * 9.81 m/s^2
≈ 289.4 N
Therefore, the maximum force that can be exerted horizontally on the crate without moving it is approximately 289.4 N.
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what type of transducer is most commonly used in a loudspeaker, and what kind of microphones use this same principle of transduction?
Electrodynamic transducers are commonly used in loudspeakers and dynamic microphones. They work by using a diaphragm, voice coil, and magnet to convert electrical signals into sound waves or vice versa.
The most commonly used type of transducer in a loudspeaker is an electrodynamic transducer. This type of transducer consists of a diaphragm, voice coil, and magnet. When an electrical signal is applied to the voice coil, it creates a magnetic field that interacts with the magnet and causes the diaphragm to vibrate and produce sound waves.
The same principle of electrodynamic transduction is also used in dynamic microphones. These microphones have a similar design to loudspeakers, with a diaphragm and voice coil that are connected to a magnet. When sound waves enter the microphone, they cause the diaphragm to vibrate, which creates an electrical signal in the voice coil that is then sent to an amplifier or recording device.
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3.4 amperes of current flow through a wire. (a) what net charge flows past a point in the wire each second? (b) what is the net charge on the wire? explain this last one.
(a) The net charge that flows past a point in the wire each second can be calculated by using the formula:
Q = I * t
where Q is the net charge, I is the current, and t is the time.
Substituting the given values, we get:
Q = 3.4 A * 1 s = 3.4 C
Therefore, 3.4 coulombs of charge flow past a point in the wire each second.
(b) The net charge on the wire can be found by multiplying the current by the time the current flows. However, if the current is constant, the net charge on the wire would be infinite since the charge would continue to accumulate over time.
In reality, a wire has a finite amount of charge that can be stored, and the charge density (charge per unit length) is proportional to the electric field within the wire. This electric field, in turn, is proportional to the potential difference (voltage) applied across the wire. Therefore, the net charge on the wire depends on the wire's properties, such as its resistance and capacitance, and the external circuit connected to it. Without additional information, it is impossible to determine the net charge on the wire based on the given information.
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for a body to be in equilibrium under the combined action of several forces.
a)any 2 of this forces should be balanced by a third force.
b)all forces form pair of equal and opposite forces. c)sum of torque about any point must be zero.
d)the lines of action of all the forces must pass through the centre of gravity of the body
For a body to be in equilibrium under the combined action of several forces, the sum of torque about any point must be zero.
In order for a body to be in equilibrium, it must have no net force acting on it, meaning that all forces acting on the body must cancel each other out. In addition to this, the sum of torque about any point must also be zero, which means that the forces must be balanced in terms of their rotational effect on the body.
This is because torque is a measure of the tendency of a force to rotate an object around an axis or pivot point. In addition, the lines of action of all the forces must pass through the centre of gravity of the body, which is the point at which the body's weight is considered to act. This ensures that the forces are balanced and there is no net torque acting on the body.
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) a single slit 1.00 mm wide is illuminated by light of wavelength 589 nm. we see a diffraction pattern on a screen 3.00 m away. what is the width of the first diffraction maximum on each side of the central diffraction maximum?
The width of the first diffraction maximum on each side of the central diffraction maximum is 4.25 mm.
When a single slit is illuminated by a monochromatic light source, the light diffracts and produces a pattern of bright and dark fringes on a screen placed at a distance from the slit. The distance between two adjacent bright fringes is called the fringe spacing or the distance between maxima. To calculate the width of the first diffraction maximum on each side of the central diffraction maximum, we need to use the formula:
sinθ = (mλ) / a
Where,
θ = angle between the central maximum and the first diffraction maximum
m = order of the maximum (m = 1 for the first maximum)
λ = wavelength of light
a = width of the single slit
We can rearrange the formula to find the distance between the central maximum and the first diffraction maximum on each side:
sinθ = (mλ) / a
θ = sin^-1((mλ) / a)
Distance between maxima = 2x(d x tanθ)
Where d is the distance between the screen and the slit.
Substituting the values given in the problem, we get:
θ = sin^-1((1 x 589 x 10^-9) / (1 x 10^-3)) = 0.598 radians
Distance between maxima = 2 x (3 x tan(0.598)) = 4.25 mm
Therefore, the width of the first diffraction maximum on each side of the central diffraction maximum is 4.25 mm.
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When a mass is attached to a vertical spring, the spring is stretched a distance d. The mass is then pulled down from this position and released. It undergoes 50 oscillations in 30 s. What is the distance d?
The distance d is approximately 0.695 meters. When a mass is attached to a vertical spring, the spring is stretched a distance d.
To determine the distance d, we need to use the formula for the period of oscillation of a mass-spring system, which is T=2π√(m/k), where T is the period, m is the mass, and k is the spring constant.
In this problem, we know that the mass undergoes 50 oscillations in 30 seconds, which means that the period is 30/50 = 0.6 seconds. Therefore, we can rearrange the formula to solve for d:
T = 2π√(m/k)
0.6 = 2π√(m/k)
0.3/π = √(m/k)
(0.3/π)^2 = m/k
Now, we need to find the value of m/k. We can use the fact that the spring is stretched a distance d to relate k to d:
k = mg/d
where g is the acceleration due to gravity (9.81 m/s^2). Substituting this into our equation for m/k, we get:
(0.3/π)^2 = m/(mg/d)
d = (m/g) * (0.3/π)^2
We don't know the value of m, but we can cancel it out by using the fact that the mass-spring system oscillates with simple harmonic motion. For small amplitudes (which we can assume in this problem), the displacement of the mass from its equilibrium position is proportional to the stretching of the spring. In other words:
d = A * sin(2πt/T)
where A is the amplitude of oscillation. We know that the mass is initially pulled down from a position of equilibrium (where d = 0), so the amplitude is equal to the initial displacement, which is d. Thus, we can rewrite the equation as:
d = d * sin(2πt/T)
which simplifies to:
1 = sin(2πt/T)
Solving for T, we get:
T = 2π/sin^-1(1) = 2π
Now we can substitute this value of T into our equation for d:
d = (m/g) * (0.3/π)^2
d = (m/g) * 0.0289
d/T = (m/g) * 0.0289 / 2π
Since we know that T = 0.6 seconds and d/T = 1/2π (because the mass starts at the equilibrium position), we can solve for d:
d = (m/g) * 0.0289 * 2π
1/2π = (m/g) * 0.0289 * 2π
m/g = 1/(0.0289 * 4π^2)
m/g = 0.958
d = (0.958) * 9.81 * 0.0289 * 2π = 0.695 meters
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a 44.4 kg girl is standing on a plank that has a mass of 159 kg. the plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless supporting surface. the girl begins to walk along the plank at a constant speed of 1.49 m/s relative to the plank.
As the girl walks along the plank at a constant speed of 1.49 m/s, the plank will also move on the frozen lake due to the conservation of momentum. Since the surface of the lake is frictionless, there is no external horizontal force acting on the system (girl and plank), making the total momentum of the system constant.
Let's denote the girl's mass as m1 (44.4 kg) and the plank's mass as m2 (159 kg). The girl's speed relative to the plank is v1 (1.49 m/s), and the speed of the plank relative to the frozen lake is v2.
Applying the conservation of momentum:
m1 * v1 = m2 * (-v2) (the negative sign indicates that the plank moves in the opposite direction of the girl)
44.4 kg * 1.49 m/s = 159 kg * (-v2)
Now, solving for v2:
v2 = (44.4 kg * 1.49 m/s) / 159 kg = -0.418 m/s
The negative sign indicates that the plank moves in the opposite direction of the girl's motion. The speed of the plank relative to the frozen lake is 0.418 m/s.
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A funnel is dipped into a liquid soap solution. State and explain what happens to the soap bubble when the funnel is removed
Answer: When a funnel is dipped into a liquid soap solution, soap molecules from the solution stick to the surface of the funnel and form a thin film. As the film becomes thinner, it reaches a point where it can no longer support its own weight, and gravity causes it to detach from the funnel and form a soap bubble.
When the funnel is removed, the soap bubble remains intact due to the surface tension of the soap film. Soap molecules have hydrophilic (water-attracting) and hydrophobic (water-repelling) ends, which enable them to form a stable film at the surface of the liquid. The surface tension of the soap film creates a force that tries to minimize the surface area of the bubble, which is why soap bubbles tend to form spherical shapes.
However, the soap bubble is not stable and will eventually burst due to a number of factors, such as evaporation of the liquid, changes in temperature or humidity, or contact with other objects. When the soap bubble bursts, the soap film breaks apart and the soap molecules mix with the surrounding air or liquid.
Explanation:
When a funnel is dipped into a soap solution and removed, a soap bubble forms due to the surface tension of the soap solution. As air is blown into it, the bubble expands until it pops when the soap film can't withstand the pressure difference anymore.
Explanation:When a funnel is dipped into a liquid soap solution and then removed, a soap bubble forms at the end of the funnel. This phenomenon occurs due to a property of liquids known as surface tension. Surface tension is the force that causes the liquid surface to contract, thus forming a shape with the minimum possible area, a sphere.
After the funnel is dipped into the soap solution, a thin film of soap solution forms inside it. When the horn is removed and the air is blown from the other end, the air trapped inside the thin soap film expands to include a bubble.
Eventually, gravity causes the liquid soap to flow downwards, thinning the top of the bubble, and the bubble will pop when the film is too thin to sustain the pressure difference between the inside and outside. So, stating and explaining what happens to the bubble when the funnel is removed can also take into consideration the effect of gravity in this process.
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an object is held at a distance of 19.0 cm from a convex mirror creating an image that is 1/6 the object size. what is the focal length of the mirror?
If an object is held at a distance of 19.0 cm from a convex mirror creating an image that is 1/6 the object size. then the focal length of the convex mirror is approximately 361.2 cm.
To answer this question, we can use the mirror equation: 1/f = 1/d_o + 1/d_i, where f is the focal length, d_o is the distance of the object from the mirror, and d_i is the distance of the image from the mirror. We know that d_o = 19.0 cm and the magnification (M) is -1/6 (since the image is inverted and smaller than the object).
Using the magnification formula, M = -d_i/d_o, we can solve for d_i = (-1/6) * 19.0 cm = -3.17 cm. Note that the negative sign indicates that the image is virtual (i.e., it cannot be projected on a screen).
Now, substituting the values of d_o and d_i into the mirror equation, we get: 1/f = 1/19.0 cm - 1/(-3.17 cm), which simplifies to 1/f = 0.0526 cm^-1. Solving for f, we get f = 19.0 cm / 0.0526 cm^-1 = 361.2 cm. Therefore, the focal length of the convex mirror is approximately 361.2 cm.
In conclusion, the focal length of a convex mirror can be determined using the mirror equation, which involves the distances of the object and image from the mirror. It is important to pay attention to the signs of these distances and the magnification factor to correctly interpret the nature and size of the image.
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Relative to sea level, would it be slightly more difficult or somewhat easier to drink through a straw at the bottom of a deep mine? At the top of a high mountain?
At the bottom of a deep mine, it would be somewhat easier to drink through a straw compared to drinking at sea level. This is because the pressure at the bottom of the mine is higher than at sea level, due to the weight of the air above. Higher air pressure will help push the liquid up the straw, making it easier to drink.
On the other hand, at the top of a high mountain, it would be slightly more difficult to drink through a straw compared to drinking at sea level. This is because the air pressure at high altitudes is lower than at sea level due to the thinner air. Lower air pressure will create less force to push the liquid up the straw, making it slightly more difficult to drink.
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5.83 mm high firefly sits on the axis of, and 13.5 cm in front of, the thin lens a, whose focal length is 5.99 cm. behind lens a there is another thin lens, lens b, with a focal length of 29.9 cm. the two lenses share a common axis and are 55.5 cm apart.
Is the image of the firefly that lens B forms real or virtual? How far from lens B is this image located (expressed as a positive number)? What is the height of this image (as a positive number)? Is this image upright or inverted with respect to the firefly?
The image formed by lens B is virtual since the object is located closer to the lens than the focal point. The image is located 21.59 cm behind lens B and is 1.17 mm high. The image is upright with respect to the firefly since the object is located farther away from lens A than its focal length, resulting in an inverted image.
The firefly is located 13.5 cm in front of lens A, which has a focal length of 5.99 cm. Using the lens formula, 1/f = 1/u + 1/v, we can find the image distance (v) for lens A. The image formed by lens A acts as the object for lens B, which has a focal length of 29.9 cm and is 55.5 cm away from lens A. Using the lens formula again, we can determine the image distance for lens B.
As the image distance is positive, the image formed by lens B is real. To find the height of this image, use the magnification formula: m = image height / object height. The image is inverted compared to the firefly since the magnification is negative.
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The force due to gravity that acts on a block of ice that slides down an icy ramp
A) decreases as the slope of the ramp increases
B) becomes greatest when the ramp is vertical
C) remains equal to mg at all angles
The force due to gravity that acts on a block of ice that slides down an icy ramp remains equal to C. mg at all angles, where m is the mass of the block and g is the acceleration due to gravity.
This is because the force due to gravity is always acting vertically downwards on the block of ice, and it is proportional to the mass of the block. The angle of the ramp only affects the component of the force due to gravity that is acting parallel to the surface of the ramp, which contributes to the acceleration of the block down the ramp.
As the angle of the ramp increases, the component of the force due to gravity acting parallel to the ramp increases, while the component acting perpendicular to the ramp decreases. However, the magnitude of the force due to gravity itself remains constant, and is always equal to mg.
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two light bulbs (treat them as regular resistors) are connected to a battery as shown in the figure. initially, the switch is open and bulb 1 is glowing. what happens to the brightness of bulb 1 when the switch is closed?
When the switch is closed, the circuit is completed, connecting both light bulbs (resistors) in parallel. This causes the overall resistance of the circuit to decrease, leading to an increase in current from the battery. As a result, the brightness of bulb 1 decreases since the current is now shared between both bulbs.
First, let's look at what's happening with just bulb 1. When the circuit is closed and the switch is open, the current is flowing through bulb 1 and creating light. Bulb 1 has a certain resistance, which determines how much current can flow through it and how bright it will shine.
Now, when we close the switch, we're essentially adding another resistor (bulb 2) to the circuit. This changes the total resistance of the circuit, which affects the current flow through each bulb.
To determine what happens to bulb 1's brightness when the switch is closed, we need to think about the total resistance of the circuit. Let's say that each bulb has a resistance of 75 ohms (this is just an example). When the circuit is closed, the total resistance would be:
Rtotal = R1 + R2
Rtotal = 75 + 75
Rtotal = 150
So the total resistance of the circuit is 150 ohms.
Now, let's think about what this means for the current flow through each bulb. The current flowing through each bulb depends on the voltage of the battery and the resistance of each bulb. If we assume that the battery has a voltage of 9 volts (again, just an example), then we can use Ohm's Law to calculate the current flowing through each bulb:
I = V/R
For bulb 1:
I1 = 9/75
I1 = 0.12 amps
For bulb 2:
I2 = 9/75
I2 = 0.12 amps
So when the switch is closed, each bulb has a current of 0.12 amps flowing through it.
Well, the brightness of a bulb is directly related to the current flowing through it. So if the current through bulb 1 is the same as before (0.12 amps), then the brightness should be the same as before as well.
In other words, when the switch is closed, the brightness of bulb 1 should not change.
When the switch is closed, the total resistance of the circuit increases, but the current through each bulb stays the same. Therefore, the brightness of bulb 1 should not change.
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When the switch is closed, the brightness of the bulb1 will decrease.
Based on the circuit diagram, when the switch is open, the circuit is a parallel circuit, with bulb 1 and bulb 2 connected in parallel to the battery. The current from the battery splits into two branches, with some of the current flowing through bulb 1 and some of the current flowing through bulb 2. Since bulb 1 has a lower resistance than bulb 2, it will receive more current and will glow brighter than bulb 2.
When the switch is closed, the circuit becomes a series circuit, with bulb 1 and bulb 2 connected in series to the battery. In a series circuit, the same current flows through all components in the circuit. The total resistance of the circuit is the sum of the resistances of bulb 1 and bulb 2. If bulb 2 has a higher resistance than bulb 1, then the total resistance of the circuit will increase when the switch is closed, and the current through both bulbs will decrease. This means that the brightness of both bulbs will decrease when the switch is closed, including the brightness of bulb 1. Therefore, when the switch is closed, the brightness of bulb 1 will decrease.
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Which of these best describes the type of lens shown in the ray diagram
The type of lens shown in the ray diagram that we heave here is a convex lens. Option B
What is the ray diagram?The route that light rays take as they pass through an optical device, such as a lens, mirror, or prism, is depicted graphically in a ray diagram.
Several essential components, including an object, a lens or mirror, and an image, are present in a typical ray diagram.
The ray diagram that is shown here indicates the lens type to be a convex lens as shown in the image above us.
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Missing parts;
A. Concave lens
B. Convex lens
C. Bifocal lens
Calculate in newtons the weight of a 2.5 kg melon. What is its weight on pounds?
The weight of the 2.5 kg melon is approximately 24.5 newtons or 5.5 pounds. It's important to note that the weight of an object can vary depending on the location due to differences in the acceleration due to gravity. This calculation assumes a standard Earth gravity of 9.8 m/s².
To calculate the weight of a 2.5 kg melon in newtons, we can use the formula:
Weight = mass × acceleration due to gravity
The acceleration due to gravity on Earth is approximately 9.8 m/s². Therefore, the weight of the melon in newtons is:
Weight = 2.5 kg × 9.8 m/s² = 24.5 N
To convert the weight from newtons to pounds, we need to use the conversion factor:
1 pound = 4.44822 newtons
Dividing the weight in newtons by the conversion factor, we can determine the weight in pounds:
Weight in pounds = 24.5 N ÷ 4.44822 N/pound = 5.5 pounds
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Why is physics used to study car crashes?
A.
Energy and matter are involved in car crashes.
B.
Physicists are very worried about driving.
C.
Car crashes are very dangerous.
D.
Most people have been in at least one car crash.
Physics is used to study car crashes because energy and matter are involved in car crashes. Car crashes involve the transfer of energy and momentum between the vehicles, the passengers, and the surrounding environment.
In order to understand the forces involved in a car crash, physicists use principles such as Newton's laws of motion and the conservation of energy and momentum. By analyzing the physics of car crashes, researchers can design safer vehicles and improve the safety features that protect passengers during an accident.
For example, understanding how seat belts and airbags work involves an understanding of the physics of collisions. Seat belts work by applying a restraining force to the passenger, preventing them from moving forward with the vehicle during a collision. Airbags work by slowing down the passenger's forward motion and reducing the impact force of the collision.
By using physics to study car crashes, researchers can also simulate crashes and test safety features in a controlled environment. This can help to identify potential weaknesses in the design of a vehicle or its safety features, and allow engineers to make improvements before a car is released to the market. Overall, the study of physics is crucial for improving the safety of vehicles and reducing the number of injuries and fatalities that result from car crashes.
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Consider a sample of ice at O degrees C. If the temperature is decreased, the volume of the ice A) increases. B) decreases. C) stays the same.
Answer: B
Explanation:
Heating up objects makes them expand, this is called thermal expansion and is due to the fact that the molecules of the object are now moving faster than before and thus are further away from each other. The same logic applies to cooling down objects. Cooling down objects makes them contract due to the fact that the molecules of the object are now slower than before and thus get closer to each other.
If the temperature of ice at 0 degrees Celsius is decreased, the volume of the ice will decrease. Hence the correct answer is b.
This is because water undergoes a phase change from a solid to a liquid as it warms up, and a phase change from a liquid to a solid as it cools down. When water freezes, its molecules arrange themselves into a rigid, crystalline structure with a fixed volume.
As the temperature of the ice is lowered, the molecules move less and less, and the attractive forces between them become stronger, causing the ice to contract and occupy less volume.
Therefore the correct option is B
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slash-and-burn agriculture affects global warming by __________.
Slash-and-burn agriculture affects global warming by releasing large amounts of carbon dioxide into the atmosphere.
This is because when farmers burn vegetation to clear land for agriculture, the carbon stored in the vegetation is released into the air. This contributes to the overall increase in greenhouse gases, which trap heat in the atmosphere and lead to global warming. Additionally, the loss of trees and other vegetation reduces the amount of carbon that can be absorbed through photosynthesis, further exacerbating the problem.
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if you measured rv, vs, tv, and vu, what would be true about the relationship between their lengths? complete the explanation.
It is not possible to determine the relationship between the lengths of RV, VS, TV, and VU based solely on their measurements.
The lengths of these line segments are relative to their starting and ending points and their orientations in space.
Without additional information about their positions and orientations, it is impossible to determine whether any of the line segments are parallel, perpendicular, or at other angles to each other.
The lengths of these line segments can be determined using the distance formula or by measuring them with a ruler or other measuring tool.
However, without additional information, the lengths alone do not provide enough information to determine their relationship to each other.
To determine the relationship between these line segments, additional information about their spatial relationships would be required, such as their angles of intersection or whether they lie in the same plane.
Once this information is known, it may be possible to determine the relationship between their lengths, such as whether they are equal, proportional, or have some other relationship.
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the average threshold for human vision is a candle flame seen from ________ on a dark, clear night.
The average threshold for human vision is a candle flame seen from about 30 miles away on a dark, clear night.
The human eye is capable of detecting very faint sources of light, and the threshold for vision is typically defined as the minimum amount of light energy that is required to stimulate the retina and produce a visual sensation.
The average threshold for human vision is equivalent to a candle flame seen from about 30 miles away on a dark, clear night. This means that under ideal viewing conditions, a person with normal vision can see a single candle flame that is located at a distance of 30 miles, assuming there are no other sources of light or atmospheric obstructions that could interfere with the viewing process.
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two polarizers are to be placed in front of some unpolarized light. there are two possible ways of arranging the polarizers, both shown below. i. which arrangement will allow through more of the light? a. left b. right c. they will allow through equal amounts
If two polarizers are placed in front of unpolarized light, the arrangement that will allow through more of the light is the one where the axes of the polarizers are perpendicular to each other (arrangement on the right).
This is because the first polarizer will polarize the light in one direction, and the second polarizer will only allow through the light that is polarized in the same direction as its axis. When the axes of the polarizers are perpendicular, only a small amount of light will be able to pass through both polarizers, resulting in a lower intensity of light transmitted. On the other hand, when the axes of the polarizers are parallel (arrangement on the left), more light will be transmitted as the polarizers will not block each other completely.
When arranging two polarizers in front of unpolarized light, the amount of light that passes through depends on the angle between their polarizing axes. In arrangement A, the polarizers are aligned with their axes parallel, allowing the maximum amount of light to pass through. In arrangement B, the axes are not parallel, which will block more light from passing through. Therefore, arrangement A (left) will allow more light to pass compared to arrangement B (right).
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A coin is dropped into a shallow lake. As the coin sinks, the buoyant force on the coin Select one: O a. increases as the depth increases O b. decreases as the depth increases. O c. decreases as the depth decreases O d. does not change O e. increases as the speed increases.
The buoyant force on the coin dropped into a shallow lake is determined by the displaced water. As the coin sinks, the volume of water displaced by the coin increases, which in turn increases the buoyant force acting on the coin.
Therefore, the correct answer is a) increases as the depth increases. It's important to note that the depth of the water does not directly affect the buoyant force, but rather the volume of water displaced. This principle is important in understanding how objects float in water and is known as Archimedes' principle.
The correct answer to your question is option d: the buoyant force on the coin does not change as it sinks. This is because the buoyant force is determined by the volume of fluid displaced by the object, which in this case is the coin, and the density of the fluid, which is the water in the lake. Since the volume and density of both the coin and the water do not change as the coin sinks, the buoyant force remains constant throughout its descent.
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A machinist bores a hole of diameter 1.30 cm in a steel plate at a temperature of 27.0 ∘ C .
Part A
What is the cross-sectional area of the hole at 27.0 ∘ C .
Express your answer using four significant figures.
Part B
What is the cross-sectional area of the hole when the temperature of the plate is increased to 175 ∘ C ? Assume that the coefficient of linear expansion remains constant over this temperature range.
Express your answer using four significant figures.
The final cross-sectional area comes out to be 1.34 cm^2
Part A: The cross-sectional area of the hole at 27.0 ∘ C can be calculated using the formula A=πr^2, where r is the radius of the hole. Since the diameter of the hole is given as 1.30 cm, the radius is 0.65 cm. Substituting this value in the formula, we get A=3.14*(0.65 cm)^2 = 1.33 cm^2 (rounded to four significant figures).
Part B: When the temperature of the plate is increased to 175 ∘ C, the steel plate and the hole will expand due to the coefficient of linear expansion. Assuming that the coefficient of linear expansion remains constant, we can use the formula ΔL = αLΔT, where ΔL is the change in length, α is the coefficient of linear expansion, L is the original length, and ΔT is the change in temperature. Since we know the initial and final temperatures and the original diameter of the hole, we can calculate the final diameter using ΔL = (2r)αΔT and then use the formula A=πr^2 to find the cross-sectional area. The final cross-sectional area comes out to be 1.34 cm^2 (rounded to four significant figures).
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an old campfire is uncovered during an archaeological dig. its charcoal is found to contain less than 1/1000 the normal amount of 14c. show answer no attempt find the minimum age (in years) of the charcoal. carbon-14 has a half-life of 5730 years which means half of it will be gone after 5730 years. you may find the equality 210
Therefore, the minimum age of the charcoal is 21070 years. It is important to note that this is just an estimate, and the actual age could be slightly older or younger depending on various factors such as contamination and measurement error.
The fact that the charcoal contains less than 1/1000 the normal amount of carbon-14 indicates that a significant amount of time has passed since the campfire was last used. To find the minimum age of the charcoal, we can use the fact that the amount of carbon-14 remaining in a sample decreases exponentially with time. Specifically, after n half-lives, the amount of carbon-14 remaining is 1/2^n times the original amount.
Using the given half-life of carbon-14 (5730 years), we can set up the following equation:
1/1000 = (1/2)^(n/5730)
To solve for n, we can take the logarithm of both sides:
log(1/1000) = (n/5730) log(1/2)
Solving for n, we get:
n = 21070 years
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