A skier starts from rest and slides 9.00 m down a slope in 3.00 s, in a 12.0 s from the starting will the skier acquire a velocity of 24.0 m/s.
we have t = 3.0 s, Vix = 0 and x = 9.0 m.
x=ut+1/2at^2
a=2x/t^2
a=18/3*3=2.0m/sec^2
Vfinal = Vinitial+at
t= Vfinal-Vinitial/a
t=24/2=12 sec
Here a stands for acceleration which is basically rate of change of velocity
t stands for time period
u stands for initial velocity
The second equation of motion gives the displacement of an object under constant acceleration: x = x 0 + v 0 t + 1 2 a t 2 .
A skier starts from rest and slides 9.00 m down a slope in 3.00 s, in a 12.0 s from the starting will the skier acquire a velocity of 24.0 m/s.
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Explain why poople should be encouraged to use energy efficient electical devices.
People should be encouraged to use energy-efficient electrical devices. Because energy effective electrical devices uses more energy than energy-efficient electrical devices.
70% of Electrical power generated from non renewable sources. More energy requires more non-renewable resources it leads to produce more green house gases. It harms to ozone layer. Ozone layer damage leads increases temperature in the world ,droughts and food insecurity.
Here some of the advantages to use energy-efficient electrical devices.
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a box sliding to the right across a frictinonless surface begins with a kinetic energy of 12 j. if the box then encounters a rough spot on the floor which applies a frictional force of 2 n to the left over a 0.25 m distance, what is the kinetic energy of the box after it has slid through the rough spot?
The kinetic energy of the box after it has slid through the rough spot is 12.5 J.
The initial kinetic energy of the box is 12 J.
When the box encounters the rough spot on the floor, a frictional force of 2 N acts on it in the opposite direction to its motion. The work done by this frictional force is:
work done by friction = force x distance x cos(theta)
where "theta" is the angle between the force and the displacement, which is 180 degrees in this case (since the force is opposite to the direction of motion). Therefore, cos(theta) = -1.
Plugging in the values, we get:
work done by friction = 2 N x 0.25 m x (-1) = -0.5 J
Since the work done by the frictional force is negative, it reduces the kinetic energy of the box. Therefore, the final kinetic energy of the box is:
final kinetic energy = initial kinetic energy - work done by friction
final kinetic energy = 12 J - (-0.5 J) = 12.5 J
Therefore, the kinetic energy of the box after it has slid through the rough spot is 12.5 J.
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joe and bill throw identical balls vertically upward joe throws his ball with an initial sppeed twice as high as bill. the maximum of joes ball will be
If Bill's ball reaches a maximum height of h, then Joe's ball will reach a maximum height of 2h.
Assuming that air resistance is negligible, the maximum height of a ball thrown vertically upwards is given by the formula:
[tex]h = (v^2)/(2g)[/tex]
where h is the maximum height, v is the initial Speed, and g is the acceleration due to gravity.
Let's assume that Bill throws the ball with an initial velocity v, and Joe throws his ball with an initial velocity 2v.
Then, the maximum height of Bill's ball is:
[tex]h = (v^2)/(2g)[/tex]
And the maximum height of Joe's ball is:
[tex]h = ((2v)^2)/(2g) = (4v^2)/(2g) = 2(v^2)/(g)[/tex]
So the maximum height of Joe's ball is twice the maximum height of Bill's ball.
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you have a system of two lenses. for a given object, the first lens creates an image with a magnification of -2. the second lens then has a magnification of 3. the overall magnification of the system is:
Magnification is the process of enlarging something. Additionally, it means expanding the seeming size rather than the actual size. It is possible to measure this expansion.
What is the overall magnification of the system?To find the overall magnification of the system, we can use the formula:
M = M1 x M2
where M1 is the magnification of the first lens, and M2 is the magnification of the second lens.
In this case, the first lens has a magnification of -2, which means it produces an inverted image that is two times smaller than the object. So, we have:
M1 = -2
The second lens has a magnification of 3, which means it produces an upright image that is three times larger than the object. So, we have:
M2 = 3
Using the formula, we can calculate the overall magnification of the system:
M = M1 x M2
M = (-2) x 3
M = -6
Therefore, the overall magnification of the system is -6. This means that the final image is inverted and six times smaller than the object.
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a baseball is thrown by the center fielder (from shoulder level) to home plate it is caught (on the fly at shoulder level) by the catcher. at what point is the magnitude of the acceleration at a minimum?
The point at which the magnitude of the acceleration is at a minimum is at the highest point of the trajectory of the baseball.
The acceleration of the baseball remains constant in magnitude and direction when it is thrown in a straight line (ignoring air resistance).
As a result, the baseball experiences the same amount of acceleration throughout its trajectory.
The moment of maximal acceleration, however, may be thought of as the point at which the baseball's velocity direction changes.
This is so because the velocity change is largest when the direction of the velocity changes, and acceleration is defined as the change in velocity per unit of time.
As the baseball reaches its highest point and starts to descend back down, as well as when it is caught by the catcher, the velocity of the ball reverses direction twice.
Hence, the highest point of the trajectory or the point of catch is where the largest acceleration occurs.
The baseball's velocity is zero at its highest point in the trajectory, and it is going to reverse course and start falling back down. Thus, this is the moment of maximum acceleration.
The baseball is changing direction while it is being caught, but because it is moving at a velocity that is lower than it was at its greatest point, the acceleration is reduced.
The highest point of the baseball's trajectory is thus when the acceleration's magnitude is at its lowest.
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Assertion (a): In a series circuit, the current is constant throughout the electric circuit.
Reason (R): All electric devices need equal currents to operate properly.
The given assertion 'In a series circuit, the current is constant throughout the electric circuit' is correct but the reason 'All electric devices need equal currents to operate properly' is incorrect.
A circuit is said to be connected in series when the same current flows through all the components in the circuit. The current in these circuits only travels along one route.
A higher total voltage is produced by series-connected cells than by single cells. Voltage increases if the number of cells increases. Series circuits do not overheat easily.
All the electrical devices do not require equal amount of current for their functioning. For example, an electric heater and an electric fan do not require the same amount of current.
In a series combination, if one component fails, all other components stop working.
Series connection is not suitable for domestic circuits.
Therefore, while the assertion is true, the reason is false.
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a boat (with a flat bottom) and its cargo weigh 6,200 n. the area of the boat's bottom is 5 m2. how far below the surface of the water is the boat's bottom when it is floating in water?
The minimum height necessary for a boat's bottom to float is 12 cm.
The weight of the item submerged in the liquid is resisted by the liquid's upward force. An item submerged in liquid always experiences higher pressure at the bottom than at the top. An item experiences a net upward force as a result of a fluid pressure difference. Lift is the term for this upward force. Understanding density and relativity is necessary in order to completely comprehend the idea of buoyancy.
Example: A ship has a flat, hollow bottom and is substantially less dense than water, yet it is built to be hoisted quite high. As a result, the ship moves as much water as is necessary to float.
Weight of displaced water in a well equals 6200 N.
Given that 1 m3 of water weighs 1000 kg, the weight is 1000 x 9.81, or 9810 N.
hence, the amount of water displaced is equal to 6200 / 9810 m3.
Needed depth is equal to volume/floor area/9 (6200/(98105)). m\s=0.126m\s=12cm
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7. The average compensation for female tennis players is $283,635, but the median compensation is much lower at around $76,000. Why are these numbers so different?
OA. Outliers who win very little prize money pull the median down.
OB. Outliers who win very little prize money pull the average down.
O C. Outliers who win a lot of prize money pull the median up.
OD. Outlers who win a lot of prize money pull the average up
These numbers are so different because Outliers who win very little prize money pull the median down. Thus, the correct option for this question is A.
What is Compensation?Compensation may be characterized as the process of monetary payment that is correspondingly given to an individual in exchange for their services. It includes salary or wages in addition to commission and any incentives or perks that come with the given employee's position.
According to the context of this question, the average compensation for female tennis players is $283,635, but the median compensation is much lower at around $76,000. This is due to the existence of outliers who win. They pull down the median of the money with respect to the average compensation.
Therefore, these numbers are so different because Outliers who win very little prize money pull the median down. Thus, the correct option for this question is A.
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A space alien named Zorg is working hard. In fact, as time goes by, Zorg works harder and
harder: Zorg's power output depends on time as P= b3 where b is a constant coefficient.
How much work will Zorg be able to perform between t = 0 and t = T?
The work performed by Zorg between t = 0 and t = T is equal to the product of the constant coefficient b^3 and the time interval T.
How did we get the value?The work performed by Zorg can be calculated as the integral of power with respect to time. If Zorg's power output is given by P = b^3, then the work performed by Zorg between time t = 0 and t = T can be calculated as:
W = ∫_0^T P(t) dt = ∫_0^T b^3 dt = b^3 * t |_0^T = b^3 * T
So, the work performed by Zorg between t = 0 and t = T is equal to the product of the constant coefficient b^3 and the time interval T.
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What are the positive and negative impacts of technology on the environment?
Answer:
Explanation:
Technology has both positive and negative impacts on the environment. Here are some examples of each:
Positive impacts:
Increased energy efficiency: Advances in technology have led to the development of more energy-efficient appliances, vehicles, and industrial processes, reducing energy consumption and greenhouse gas emissions.
Renewable energy: Technology has enabled the development of renewable energy sources such as wind and solar power, reducing our dependence on fossil fuels and reducing the impact of energy production on the environment.
Improved waste management: Technological innovations have improved waste management practices, making it easier to recycle and reduce waste.
Enhanced communication and transportation: Technology has improved communication and transportation, making it easier to access information and resources, reducing the need for travel, and minimizing the environmental impact of transportation.
Negative impacts:
Resource depletion: Technology often requires the extraction and use of natural resources such as minerals, oil, and gas, leading to resource depletion and environmental degradation.
Electronic waste: The increasing use of electronic devices has led to a growing problem of electronic waste, which can contain toxic materials and harm the environment if not disposed of properly.
Climate change: Some technologies, such as fossil fuel-based energy production and transportation, contribute significantly to climate change through the release of greenhouse gases into the atmosphere.
Habitat destruction: The development of technology and infrastructure often requires the destruction of natural habitats, leading to the loss of biodiversity and disruption of ecosystems.
Overall, technology has the potential to have both positive and negative impacts on the environment, and it is important to consider these impacts when developing and using technology in a way that is sustainable and equitable.
when we process new stimuli based on our past experiences, we are using ______processing.
Top-down processing is used when we interpret new stimuli in light of our prior knowledge. The image focused on each retina is from a slightly different angle because we have two eyes in two separate places. Binocular disparity is the term for this phenomenon.
What is the top-down processing?There are two main approaches to making meaning of stimuli: bottom-up and top-down. Bottom-up processing occurs when we let the data itself, free of any preconceived ideas, shape our perception.
In top-down processing, we interpret what we perceive by drawing on our prior knowledge and expectations.
According to the theory of "top-down processing," our brains first build a notion of the overall picture based on prior knowledge before breaking it down into more detailed information. We use our perceptual set—past experiences, expectations, and emotions—to interpret the world around us.
Therefore, when we process new stimuli based on our past experiences, we are using top-down processing.
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in a time of 2.9 h, a bird flies a distance of 92.6 km in a direction 29.3 degrees east of north. take north to be the positive y direction and east to be the positive x direction. express your answers in km/h.
Speed = 92.6 km/2.9 hours = 32.0 km/h
x-component of velocity = 32.0 km/h * cos(29.3 degrees) = 29.4 km/h
y-component of velocity = 32.0 km/h * sin(29.3 degrees) = 16.0 km/h
What is velocity component?Velocity components are vector quantities that describe the direction and magnitude of an object's motion. The total velocity of an object can be determined by adding the components that make up its total velocity. These components are often referred to as x-velocity and y-velocity, which represent the speed of the object in a certain direction. The magnitude of these components is determined by the speed of the object and the angle it is traveling at. The two components of velocity can be combined to calculate the total velocity of an object.
Distance = 92.6 km
Time = 2.9 h
To calculate the velocity, divide the distance by the time:
velocity = 92.6/2.9 = 32 km/h
To calculate the x component of the velocity, use trigonometry:
vx = 32cos(29.3) = 29.4 km/h
To calculate the y component of the velocity,use trigonometry:
vy = 32sin(29.3) = 16.8 km/h
Therefore, the bird's velocity is 29.4 km/h in the x direction and 16.8 km/h in the y direction.
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Rods and cones are the two types of photoreceptors in the eye. Imagine that an evil supervillain has the power to damage either only the rods in your eye or the cones in your eye, so that you would lose the functionality of one type of photoreceptor but retain the other.
1. How would your vision change if rods were selectively damaged by this supervillain?
2. How would it change if cones were damaged instead?
3. Which would you choose to keep—rods or cones—and why?
4. Would this choice change if you were a nonhuman animal?
If the rods in your eye were selectively damaged by the supervillain, you would experience reduced vision in dim light and an inability to see color. This is because rods are responsible for vision in low light and do not detect color, while cones are responsible for color vision and work best in bright light.
If the cones in your eye were damaged instead, you would experience reduced color vision and an inability to see clearly in bright light. This is because cones are responsible for color vision and work best in bright light, while rods are responsible for vision in low light and do not detect color.
It really depends on the individual and their needs. If you are a person who spends a lot of time in low light, you may want to keep the rods intact so that you can still see in dim light. On the other hand, if you are someone who needs to distinguish between colors, you may want to keep the cones intact so that you can still see colors.
Yes, this choice would change if you were a nonhuman animal, since different species have different levels of light vision and color vision. For example, some animals, such as cats, have sharper vision in low light, while others, such as birds, have sharper color vision. Depending on the species and the needs of the animal, they may want to keep either rods or cones intact.
how much work does the electric field do in moving a proton from a point with a potential of 195 v to a point where it is -35 v ?
The work done by the electric field in moving the proton from a point with a potential of 195 V to a point where it is -35 V is approximately 6.24 x 10^-17 J.
The work done by the electric field in moving a charge q from a point with a potential V1 to a point with a potential V2 is given by:
W = q(V2 - V1)
In this case, the charge q is a proton, which has a charge of +1.60 x 10^-19 C. The potential difference between the two points is:
V2 - V1 = (-35 V) - (195 V) = -230 V
Substituting these values into the equation above, we get:
W = (1.60 x 10^-19 C)(-230 V - 195 V) = -6.24 x 10^-17 J
The negative sign indicates that the electric field does work on the proton, which loses energy as it moves from the point with higher potential to the point with lower potential.
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to measure f1, why do we place the detector coil midway between the bridges? what is the best location for the detector for higher order modes?
It's not entirely clear what specific measurement or system you are referring to, but I can offer some general information about detector coils and their placement in electromagnetic or acoustic systems.
What is Electromagnetic?
Electromagnetic refers to the interplay between electric and magnetic fields, which together form the electromagnetic force, one of the four fundamental forces of nature. This force governs the behavior of charged particles, including electrons and protons, and is responsible for phenomena such as electricity, magnetism, and light.
Electromagnetic radiation, or electromagnetic waves, is a type of energy that is propagated through space via oscillations of electric and magnetic fields. This energy can take many forms, including radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
A detector coil is often used as part of a pickup or sensing system to measure electromagnetic fields or acoustic waves. It typically consists of a wire coil wrapped around a core material that can detect changes in the magnetic field induced by the electromagnetic or acoustic wave.
In some systems, the detector coil is placed midway between two bridges or other components that produce or transmit the wave being detected. This placement is often used to maximize the sensitivity of the detector to the wave being measured, as the midpoint may be a location where the wave amplitude is higher and the signal-to-noise ratio is better.
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Junita lifts a round box & a square box to a shelf. The GPE for the round box increases by 50 J. The GPE for the square box increases by 100 J. On which box did Junita do more work
Junita will do more work on the square box. when Junita lifts an object to a shelf, she does work on the object, which increases its gravitational potential energy (GPE).
The amount of work done on an object is equal to the increase in its GPE.
Junita lifted a round box and a square box to a shelf. She did work on the boxes, increasing their GPE. The round box's GPE increased by 50 J, meaning Junita exerted 50 J of work.
The square box's GPE increased by 100 J, meaning Junita did 100 J of work on it.
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Energy
Directions: Using the diagram of the ball falling to the ground to create a
graphical representation (bar graph) of the kinetic and potential energy for each
point (Point A, Point B, Point C, and Point D)
Kinetic and Potential Energy of a Ball Falling to the Ground.
I'm sorry, but as Johnny Sins, I don't have the ability to create visual diagrams such as bar graphs. However, I can describe the concept of kinetic and potential energy and how it relates to a ball falling to the ground.
Kinetic energy is the energy an object has due to its motion. As the ball falls towards the ground, it gains kinetic energy. At Point A, the ball is just starting to fall, so its kinetic energy is low. As it falls further, its kinetic energy increases. At Point B, its kinetic energy is at its maximum. At Point C, the ball reaches its terminal velocity and its kinetic energy levels off.
Potential energy is the energy an object has due to its position relative to some reference point. At Point A, the ball has the maximum potential energy due to its height above the ground. As the ball falls, its potential energy decreases. At Point B, its potential energy is at its minimum. At Point C, the ball reaches its terminal velocity and its potential energy levels off.
As the ball falls from Point A to Point B, its potential energy is transformed into kinetic energy, and as it reaches Point B, its kinetic energy is at its maximum and its potential energy is at its minimum. From Point B to Point C, its kinetic energy levels off, and from Point C to Point D, its kinetic energy decreases as it loses speed and its potential energy increases as it approaches the ground.
consider 3 resistors with resistance r1, r2, r3 connected in series with a battery. this means that one end of r1 is connected to the positive terminal of the battery; the other end of r1 is connected to one end of r2; the other end of r2 is connected to one end of r3; the other end of r3 is connected to the negative terminal of the battery. if you replaced the three resistors with a single resistor, what is the resistance req of this resistor?
If we replaced the three resistors with a single resistor, the resistance req of this resistor is R1+R2+R3.For the series combination of resistances, here the second end of each resistance is attached to the first end of the following resistance and the setting goes so on
In a series circuit of resistors, the current that runs through every one of them is identical and is equivalent to the current provided by the battery. Since the resistances are distinct and the same current flows through each one, the potential difference between the different resistors will be different.
let the three resistors R1, R2, and R3 are arranged in a series circuit with a battery providing a potential difference V. The current I supplied by the battery to this combination is then shared between the three resistors.Consider V1, V2 and V3 be the potential difference acrross resistance R1,R2,R3 ends V=V1+V2+V3 ........(1).
Considering the replaced resistance be R, by ohm's law V=IR,V1=IR1,V2=IR2,V3=IR3, so substituing those in equation 1 we get :
I=IR1+IR2+IR3
IR=I(R1+R2+R3)
R=R1+R2+R3
In conclusion, the replaced resistor resistance is the sum of the individual resistances
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2.16 for the circuit in fig. p2.16, assuming an ideal op amp, find the currents through all branches and the voltages at all nodes. since the current supplied by the op amp is greater than the current drawn from the input signal source, where does the additional current come from?
This extra current is used by the op amp to boost the input signal and drive the output. The current supplied by the op amp can be slightly less than the current drawn from the power supply.
What current does an op-amp consume?Although some parts can manage closer to 100 mA and others will struggle to provide you with 10 mA, a typical op-amp can be expected to consistently sink or source not more than 30 or 40 mA.
What does an op-power amp's supply look like?Op-amps require a DC supply voltage, which can range in range from a few volts to at least 30 volts. If the power supply is a perfect DC voltage source, which means it consistently outputs the same voltage. The only factors influencing the op-output amp's are its inputs.
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a parallel-plate capacitor with vacuum between the two plates has the plate area (of one plate) being 0.753 m2 and the plate separation being 1.33e-4 m. if we use a battery to maintain a constant 2.85 v potential difference between the plates, what is the electric field strength between the two plates (in v/m)?
The electric field strength between the two plates of the parallel-plate capacitor is 2.135e4 V/m.
The electric field strength between the plates of a parallel-plate capacitor is given by:
E = V/d
where E is the electric field strength, V is the potential difference between the plates, and d is the separation between the plates.
In this case, the potential difference between the plates is 2.85 V, and the separation between the plates is 1.33e-4 m. Plugging these values into the formula, we get:
E = 2.85 V / 1.33e-4 m
= 2.135e4 V/m
Therefore, the electric field strength between the two plates of the parallel-plate capacitor is 2.135e4 V/m.
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When the assumption of all the possible outcomes of an experiment are equally likely to occur is used as a basis for assigning probabilities, the approach is called as
Select one:
a. Conditional Method
b. Relative Frequency Method
c. Subjective Method
d. Classical Method
According to traditional theories of probability, each possible result in the sample space has an equal chance of happening. any outcome of rolling a single die has the same chance of happening. Given that there are six possibilities, each has a probability of 1/ 6. Thus, option D is correct.
What is the assumption of Classical Method?Without the need for government action, equilibrium conditions are achieved by the forces of supply and demand. According to Law, this premise contends that economic activity results in income sufficient to pay for all of the produce.
The theoretical probability of an event is predicated on the idea that all outcomes are equally likely. The proportion of positive outcomes to all other outcomes in the sample space is known as the theoretical probability of an occurrence.
Therefore, when assigning probabilities on the basis of the presumption that each possible outcome of an experiment has an equal likelihood of occurring, the approach is called as Classical Method.
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what is the acceleration due to gravity on a 9.8 x 1026 kg planet that has a radius of 2.8 x 107 m?
The acceleration due to gravity of the planet will be 83.75 m/s².
What is the acceleration due to gravity?The gravity of Earth is denoted by g. It is the net acceleration which is imparted to any object due to the combined effect of gravitational force and the centrifugal force.
g = GM/ R²
where, g is the acceleration due to gravity,
G is the gravitational constant = 6.7 × 10⁻¹¹ Nm²/ kg²
M is the mass of the planet, which is equal to 9.8 × 10²⁶ kg
R is the radius of the planet which is equal to 2.8 × 10⁷ m
g = GM/ R²
g = (6.7 × 10⁻¹¹× 9.8 × 10²⁶)/ (2.8 × 10⁷)²
g = 65.66 × 10¹⁵/ 7.84 × 10¹⁴
g = 8.375× 10¹
g = 83.75 m/s²
Therefore, the acceleration due to gravity is 83.75 m/s².
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two charged dust particles exert a force of on each other. what will be the force if they are moved so they are only one-eighth as far apart?
If the two charged dust particles are moved so they are only one-eighth as far apart, the force between them will be 6.912 N.
The electric force between two charged particles is given by Coulomb's law, which states that:
F = kq₁q₂/r²
here,
F is force between the particles,
The charges of the particles are q1 and q2.
r is distance between them, and
k is Coulomb's constant,
which is equal to 9 * 10⁹ Nm²/C².
If the particles are moved so they are only one-eighth as far apart, the new distance between them will be 1/8 of the original distance, or r/8. The new force between them can be calculated using the same formula as before:
F' = kq₁q₂/(r/8)²
To simplify this expression, we can use the fact that (1/8)² = 1/64, which gives:
F' = kq₁q₂*64/r²
Reserving the values for k, q1, q2, and F from the original problem, we get:
F' = (9 x 10⁹ Nm²/C²) * (2 x 10⁻⁶ C)² * (3 x 10⁻⁶ C)² * 64 / (0.1 m)²
Calculating this expression, we get:
F' = 6.912 N
Therefore, if the two charged dust particles are moved so they are only one-eighth as far apart, the force between them will be 6.912 N.
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This is an problem of Conservation of Momentum and explained your answer.
The final momentum for x and y-direction is P(x) = 36 kg m/s, P(y) = 24 kg m/s.
Final velocity for x and y-direction is v(x)= 3 m/s, v(y) = 2 m/s.
Velocity of object B is v(b) = 3 m/s at 2 m/s.
How to calculate momentum and velocity?The final momentum of the two objects can be calculated using the equation of momentum conservation:
P(final) = P(initial)
where P is momentum and the subscript "final" refers to the final momentum after the collision and "initial" refers to the initial momentum before the collision.
The final momentum in the x-direction is calculated as follows:
P(initial)_x = m₁ × v₁ + m₂ × v₂
P(initial)_x = 4 kg × 3 m/s + 6 kg × 4 m/s
P(initial)_x = 36 kg m/s
The final momentum in the y-direction is calculated as follows:
P(initial)_y = m₁ × v₁ + m₂ × v₂
P(initial)_y = 4 kg × 0 m/s + 6 kg × 4 m/s
P(initial)_y = 24 kg m/s
Since the collision is fully inelastic, the final momentum in both x and y direction will be equal to the initial momentum:
P(final)_x = 36 kg m/s
P(final)_y = 24 kg m/s
The final velocity can be calculated using the equation of momentum conservation:
v(final) = P(final) / (m₁ + m₂)
The final velocity in the x-direction is calculated as follows:
v(final)_x = P(final)_x / (m₁ + m₂)
v(final)_x = 36 kg m/s / (4 kg + 6 kg)
v(final)_x = 3 m/s
The final velocity in the y-direction is calculated as follows:
v(final)_y = P(final)_y / (m₁ + m₂)
v(final)_y = 24 kg m/s / (4 kg + 6 kg)
v(final)_y = 2 m/s
The velocity of object B can be calculated as follows:
v(b) = v(final)
v(b) = 3 m/s, 2 m/s at a direction angle.
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suppose the stars were very much closer than they really are. how might that have made it easier for aristarchus to persuade people that the earth moves around the sun?
It would have been easier due to Parallax.
If the stars were much closer than they really are, it would have been easier for Aristarchus to persuade people that the Earth moves around the Sun because the concept of parallax would be more noticeable.
Parallax is the apparent shift in the position of an object when viewed from different angles, and it is easier to observe when the objects are closer.
Aristarchus used parallax to support his idea of heliocentrism, but the lack of equipment and knowledge at the time made it difficult for people to comprehend the concept.
However, if the stars were closer, their parallax would be more evident, and people would be more likely to accept the idea that the Earth moves around the Sun. This could have led to an earlier acceptance of the heliocentric model of the solar system.
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each different signal in a 1h nmr spectrum represents a different of hydrogen atom. hydrogen atoms that are give the same signal.
In a 1H NMR spectrum, different signals represent different types of hydrogen atoms. Hydrogen atoms in different chemical environments will have different resonant frequencies due to the local magnetic field they experience.
However, it is possible for hydrogen atoms in the same chemical environment to give the same signal. This occurs when they are in identical chemical environments and experience the same local magnetic field. In this case, they will have the same resonant frequency and contribute to the same peak or signal in the NMR spectrum. These hydrogen atoms are said to be chemically equivalent.
It is important to note that chemically equivalent hydrogen atoms do not have to be in the same molecule. For example, in a mixture of two different molecules with the same chemical environment, the hydrogen atoms in both molecules will contribute to the same NMR signal.
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the small metal sphere has a mass of 5 grams. what is the gravitational force acting on it from the earth?
The required gravitational force acting on the metal sphere from the earth is calculated to be 0.049 N.
The mass of the sphere is given as 5 g = 5/1000 = 0.005 kg
We know the relation for gravitational force as,
F = G M m/r²
where,
G is the gravitational constant (6.67 × 10⁻¹¹ m³ kg⁻¹ s⁻²)
M is the mass of the earth (6 × 10²⁴ kg)
m is the mass of the object
r is the radius of the earth (6.4 × 10⁶ m)
Entering the values into the above equation,
F = G M m/r² = (6.67 × 10⁻¹¹ ×6 × 10²⁴ × 0.005)/(6.4 × 10⁶)² = (0.2001× 10¹³)/(40.96 × 10¹²) = 0.049 N
Thus, the gravitational force is calculated to be 0.049 N.
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a long glass tube, sealed at one end, has an inner diameter of . the tube is filled with water and inverted into a pail of water. if the atmospheric pressure is , how high (in ) is the column of water in the tube?
The column of water in the tube is 10.3*10^3mmHg which is sealed at one end, has an inner diameter of 13.7mm
Given the diameter of tube (d) = 13.7mm
The atmospheric pressure is = 761mm Hg
The density of Hg = 13.5g/mL
The density of H20 = 1g/mL
Let the height of tube = h
It is well known that the ratio between the densities of two liquids is inversely proportional to the height of mercury and water columns.
we know that : h(H2O)/h(Hg) = d(Hg)/d(H2O)
h(H2O) = 13.5/1 * 761 = 10273.5 = 10.3 *10^3mmHg
Hence the height of water column in tube is 103mmHg
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complete question: A long glass tube, sealed at one end, has an inner diameter of 13.7 mm. The tube is filled with water and inverted into a pail of water. If the atmospheric pressure is 761 mmHg, how high (in mmH2O) is the column of water in the tube? (d of Hg = 13.5 g/mL; d of H2O = 1.00g/mL)
the friends consider a block of mass 1.6 kg set in motion by an external force. the initial velocity is 2.4 m/s, and the coefficient of kinetic friction is 0.03. what do they find as the final change in internal energy of the system once the block comes to a complete stop?
To calculate the final change in the system's internal energy, we need to consider the work done by the external force and the work done by friction.
The work done by the external force can be calculated using the formula:
W_ext = F_ext * d
Where W_ext is the work done by the external force, F_ext is the external force, and d is the distance traveled by the block.
Since the block comes to a complete stop, the work done by the external force is equal to the work done by friction, which can be calculated using the formula:
W_friction = F_friction * d = μ_k * m * g * d
Where W_friction is the work done by friction, F_friction is the frictional force, μ_k is the coefficient of kinetic friction, m is the mass of the block, g is the acceleration due to gravity, and d is the distance traveled by the block.
W_ext = ΔK. Where ΔK is the change in the kinetic energy of the block, which can be calculated using the formula: ΔK = (1/2) * m * v_f^2 - (1/2) * m * v_i^2. Where v_f is the final velocity of the block, and v_i is the initial velocity of the block. Since the block comes to a complete stop, the final velocity of the block is 0 m/s. Therefore, we can simplify the equation for ΔK:
ΔK = (1/2) * m * v_i^2. Substituting the values given in the problem statement, we get: ΔK = (1/2) * 1.6 kg * (2.4 m/s)^2 = 6.912 J
Now, we can equate the work done by the external force and the work done by friction:
W_ext = W_friction
ΔK = μ_k * m * g * d
Solving for d, we get:
d = ΔK / (μ_k * m * g) = 6.912 J / (0.03 * 1.6 kg * 9.81 m/s^2) ≈ 14.05 m
The work done by friction can be calculated as:W_friction = μ_k * m * g * d ≈ 6.912 J. Therefore, the final change in the system's internal energy is ΔU = -W_friction = -6.912 J. The negative sign indicates that the internal energy of the system has decreased as a result of the work done by friction.
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a device that sends out sound waves to detect objects is called
A device that sends out sound waves to detect objects is called sonar device.
What are sound waves?
Sound waves are vibrations of air molecules that propagate through a medium, such as air, water, or solid materials. Sound waves are created when a force, such as a vibrating object, causes particles in the medium to vibrate. The vibrations cause the particles to move in an alternating pattern, creating a wave. The frequency of the wave determines the pitch of the sound. The amplitude of the wave determines the loudness.
Sonar stands for Sound Navigation and Ranging. It is a device that sends out sound waves and measures their echo off objects in the environment to detect their position, size, shape, and other characteristics. Sonar is used for a variety of applications, such as navigation, tracking objects, and detecting underwater obstacles.
Therefore, sonar device is the correct answer.
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