Two stars are of equal luminosity. Star A is 3 times as far from you as star B. Star A appears the same brightness as star B.
The amount of energy that a star or other astronomical object emits is measured by its luminosity, which is typically expressed in terms of brightness. It depends on the star's surface area, temperature, and proximity to the observer. The evolution of a star and its ultimate fate are greatly influenced by its luminosity.
Two stars are therefore equally bright. Star A is three times farther away than star B. The brightness of star A and star B are comparable.
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42-kg gionny is trying to take off a lug nut off his tire using a tire-iron. what is the torque he can apply, in newton-meters, if he puts his whole body-weight on the tire-iron 0.31-m from the lug nut?
Gionny can apply a torque of approximately 127.63 N·m to the lug nut.
To calculate the torque that Gionny can apply to the lug nut, we need to use the formula:
Torque = Force x Distance x sin(θ)
where θ is the angle between the force vector and the lever arm (the distance from the axis of rotation to the point where the force is applied), and sin(θ) is the sine of that angle.
Assuming that Gionny's weight is the force he applies on the tire-iron, and that he can exert a force equal to his weight, we can calculate the force as:
Force = mass x gravity
where mass is Gionny's mass and gravity is the acceleration due to gravity, which is approximately 9.81 m/s^2. Therefore, the force Gionny can apply is:
Force = 42 kg x 9.81 m/s^2 = 411.42 N
The distance from the lug nut to the point where Gionny applies the force is given as 0.31 m. So the torque he can apply is:
Torque = Force x Distance x sin(θ) = 411.42 N x 0.31 m x sin(90°) = 127.63 N·m
Therefore, Gionny can apply a torque of approximately 127.63 N·m to the lug nut.
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two children are carrying a 2.00-m long uniform level board with a mass 5.00 kg, each supporting one end of the board. a 1.00-kg book is resting on the board a distance 1.20 m from one end of the board. what is the force applied by the child that is closer to the book to support the board?
The child closer to the book must apply a force of 49.05 N to support the board.
To solve this problem, we will use the principle of torque balance. The torque is the product of the force and the perpendicular distance from the force to the point of rotation. In this case, the point of rotation is the midpoint of the board.
First, we need to find the weight of the board. The weight is the force of gravity acting on the board, which is given by:
weight = mass x gravitational acceleration
weight = 5.00 kg x 9.81 m/[tex]s^2[/tex]
weight = 49.05 N
Next, we need to find the weight of the book.
The weight of the book is:
weight book = mass book x gravitational acceleration
weight book = 1.00 kg x 9.81 m/[tex]s^2[/tex]
weight book = 9.81 N
We can now find the torque due to the weight of the board and the book. The torque is the weight multiplied by the distance from the midpoint of the board:
torque weight = (weight board + weight book) x 1.00 m
torque weight = (49.05 N + 9.81 N) x 1.00 m
torque weight = 58.86 N*m
To balance this torque, the child closer to the book must apply a force perpendicular to the board at a distance from the midpoint of the board. We can call this distance x. The force applied by the child is the unknown we want to find, so let's call it F.
The torque due to the child's force is:
torque child = F x x
The torque balance equation is:
torque weight = torque child
Substituting the values we have found, we get:
58.86 N*m = F x x
We know that x = 1.20 m, so we can solve for F:
F = 58.86 N*m / 1.20 m
F = 49.05 N
Therefore, the child closer to the book must apply a force of 49.05 N to support the board.
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An object of mass 0. 16kg is moving forwards at a speed of 0. 50m/s. A second object of mass 0. 10kg is at rest. The first object strikes the second object. After the collision, the second object moves forwards at a speed of 0. 50m/ s. What is the speed of the first object after the collision?
An object of mass 0. 16kg is moving forwards at a speed of 0. 50m/s. A second object of mass 0. 10kg is at rest. 0.375 m/s is the speed of the first object after the collision.
Just apply momentum conservation since the net external force on the system is zero.
0.16 × 0.50 + 0.10 × 0 = 0.10 × 0.50 + 0.16 ×v
0.080 = 0.050 + 0.16v
0.16v = 0.030
v = 0.375 m/s
The initial velocity is the velocity of the item or system prior to the impact. In contrast, final velocity refers to the velocity of the item after the contact. Use the momentum equation p = m•v to compute the momentum or velocity of an item if given the other values. The answer is no for a single pair of equal mass items.
When two masses collide in a frame with their centers of mass at rest, each ball will leave with the same (or less) speed that it entered with.
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a toy gun mounted horizontally shoots a dart at a target. it hits the target 7.5 m away. the dart hit 0.76 m below the target. what is the muzzle velocity of the dart gun? please express your answer to three significant figures.
The muzzle velocity of the dart gun is 18.4 m/s. To solve this problem, we can use the equations of motion for projectile motion. We know that the dart travels a horizontal distance of 7.5 m and a vertical distance of 0.76 m.
We also know that the acceleration in the horizontal direction is zero, and the acceleration in the vertical direction is equal to the acceleration due to gravity, which is approximately 9.81 m/s^2. Let's first find the time it takes for the dart to travel 7.5 m horizontally. We can use the equation:
Distance = velocity x time
Rearranging this equation, we get: time = distance/velocity
Substituting the values we know, we get:
time = 7.5 m / velocity
Next, let's find the initial vertical velocity of the dart. We can use the equation: vertical distance = initial vertical velocity x time - 0.5 x acceleration x time^2
Since the dart is initially fired horizontally, its initial vertical velocity is zero. We can rearrange the above equation to solve for the initial velocity:m initial vertical velocity = vertical distance/time + 0.5 x acceleration x time
Substituting the values we know, we get: initial vertical velocity = 0.76 m / time + 0.5 x 9.81 m/s^2 x time; Now we can substitute the expression for the time we found earlier: initial vertical velocity = 0.76 m / (7.5 m / velocity) + 0.5 x 9.81 m/s^2 x (7.5 m / velocity)
Simplifying, we get:
initial vertical velocity = 0.10133 x velocity + 3.66375
Finally, we can use the Pythagorean theorem to find the muzzle velocity:
muzzle velocity = sqrt(velocity^2 + initial vertical velocity^2)
Substituting the expression we found for initial vertical velocity, we get:
muzzle velocity = sqrt(velocity^2 + (0.10133 x velocity + 3.66375)^2)
Using this method, I found that the muzzle velocity of the dart gun is approximately 18.4 m/s. Therefore, the answer to the problem is:
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A boy of 50 kg climbs a wall 2m high. Calculate the change in potential energy of the boy
Answer:
If this is the question : boy weighing 50kg climbs up a vertical height of 100m. Calculate the amount of work done by him. How much potential energy does he gain (g=9.8m/s2)
So the answer will be:
mass of boy = m = 50 kg
height = h = 100m
since boy does not move anything with his force, work done by him is zero work done on the boy = gain in potential energy
P.E=mgh P.E=50×9.8×100 P.E=49KJ so, potential energy gained by boy is 49 KJ
Explanation:
a nasa orbiter recently captured craters and formations on mars that resembled the face of which animal? a) Tiger. b) Bear. c) Cat. d) Dog
This impact may have caused Mars' distinctive "two faces" — a high, cratered crust in the southern hemisphere and a smooth, low crust in the northern hemisphere. Thus, option B is correct.
What are the captured craters and formations on mars?The appearance of a bear's nose is produced by a collapse structure with a V shape. The circular fracture could be the result of a deposit collapsing on top of an impact crater that was buried and later filled with mud or lava.
It's possible that the protrusion resembles a nose is a volcanic or mud vent. Mars may contain the largest impact crater in the solar system, which is covered in lava.
Therefore, the face of a bear appears to be formed on the surface of Mars by a hill with a V-shaped collapse structure, two craters, and a circular fracture pattern, which may represent the remains of a buried impact crater.
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how does density play a part in determining how unlike air masses react
Identification of compounds can benefit from density. It is also a useful feature since it connects (or acts as a conversion factor between) a substance's mass and volume. Volume and mass are extended (or extrinsic) qualities of matter that are quantity dependent.
What is the density playing a part in air masses detection?The force of an air mass acting on the earth's surface is known as atmospheric pressure. Remember that wind currents are created when the densities of two separate air masses differ.
Our wind currents are driven by the atmospheric pressure density, and denser air exerts a higher pressure than less dense air. Compared to the cold and dry air, the warm and humid air is less dense. The less dense air will then float on top of the thicker air in certain regions.
Therefore, Warm air masses rise while cold air masses descend because they are less dense.
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one of the key lessons from astronomy is that the same physical laws that operate on earth also operate throughout the universe. how is this fact relevant to the search for life in the universe?
The physical rules that govern the universe also govern our planet. However, the truth is that while physical rules may not alter, the constants and variables we use to approximation the properties of distant planets or solar bodies do.
Even though every solar body has unique characteristics, governing physical rules remain constant. However, in the present day, our experts have discovered a variety of outside bodies that defy fundamental rules and principles. It is not necessary for every object in the cosmos to behave according to the same physical principles because everything depends on time and space. With time and distance, they might change. As of right now, Newton, Kepler, and Einstein's fundamental physical principles all hold true; otherwise, they would all be in violation.
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Inert gas is used in filament bulb why?
Answer:
When electric current passes through the tungsten filament, it gets heated up and starts to glow at a temperature around 2500 degree Celsius. If we do not fill any gas, at vacuum condition, the filament will evaporate due to high temperature. To protect the filament from damage, we are filling the bulb with inert gas.
Explanation:
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a bolt is dropped from a bridge under construction, falling 90 m to the valley below the bridge. (a) in how much time does it pass through the last 20% of its fall? what is its speed (b) when it begins that last 20% of its fall and (c) when it reaches the valley beneath the bridge?
a) The bolt 1.38 seconds to fall through the last 20% of its fall.
b) The bolt begins the last 20% of its fall 3.06 seconds after it is dropped.
c) The speed of the bolt just before it hits the ground is 42.43 m/s.
(a) The time it takes for the bolt to fall through the last 20% of its fall can be calculated using the kinematic equation:
[tex]y = vi*t + (1/2)at^2[/tex]
where y is the distance fallen, vi is the initial velocity (which is 0), a is the acceleration due to gravity ([tex]-9.8 m/s^2[/tex]), and t is the time taken.
Let's call the total distance fallen by the bolt "d". Then, the distance fallen in the last 20% of the fall is 0.2d, and the distance fallen before that is [tex]0.8d[/tex]. So we can write:
[tex]0.2d = (1/2)at^2[/tex]
Solving for t, we get:
[tex]t = sqrt((0.2d)/(0.5*a))[/tex]
Plugging in the values, we get:
[tex]t = sqrt((0.290)/(0.5(-9.8))) = 1.38 seconds[/tex]
To find the speed of the bolt at the end of this 20% fall, we can use the kinematic equation:
[tex]v = vi + a*t[/tex]
where v is the final velocity, vi is the initial velocity (which is 0), a is the acceleration due to gravity ([tex]-9.8 m/s^2[/tex]), and t is the time taken.
Plugging in the values, we get:
[tex]v = 0 + (-9.8)*1.38 = -13.524 m/s[/tex]
The negative sign indicates that the velocity is downward.
(b) The time at which the bolt begins the last 20% of its fall can be found by multiplying the total time taken to fall by 0.8 (since the first 80% of the fall takes 80% of the total time):
[tex]t_start = 0.8sqrt((2d)/g) = 0.8sqrt((2*90)/9.8) = 3.06 seconds[/tex]
(c) The speed of the bolt just before it hits the ground can be found using the kinematic equation:
[tex]v^2 = vi^2 + 2ay[/tex]
where v is the final velocity, vi is the initial velocity (which is 0), a is the acceleration due to gravity [tex](-9.8 m/s^2)[/tex], and y is the distance fallen.
Plugging in the values, we get:
[tex]v = sqrt(0 + 2*(-9.8)*90) = 42.43 m/s[/tex]
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if you walk 3 kilometers in 30 minutes what is your average speed
For these paces, one hour is equivalent to 3.27 miles or 5.26 kilometers for women and 3.8 miles or 6.1 kilometers for males in terms of distance.
What is the parameter for determining average speed?The ratio of the total distance travelled by the body to the amount of time it took to complete that distance can be used to calculate average speed.
Formula for the average speed of a moving object with a range of speeds. The minute the minutes cancel, giving us kilometres per hour, and the speed would be 6 kilometres per hour; it then asks us to compare.
A student's average speed while walking would be 9 km/h if they covered a distance of 3 km in 20 minutes.
Therefore, to convert it to kilometres per hour, we can do so by simply converting our minutes into hours and remembering that there are 60 minutes in an hour.
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what mass of fe and co₂ could be formed by the reaction of 0.22 mol of fe₂o₃ with 5.5 mol of co?
The mass of [tex]Fe[/tex] is 24.56g and [tex]CO2[/tex] is 726.165g could be formed by the reaction of 0.22 mol of [tex]Fe2O3[/tex] with 5.5 mol of [tex]CO[/tex].
Given the number of moles of [tex]Fe2O3[/tex] is = 0.22mol
The number of moles of [tex]CO[/tex] = 5.5mol
The reaction of given compounds Fe2O3 and CO is described as below:
[tex]Fe2O3 + 3CO --- > 2Fe + 3CO2[/tex]
Here, we can see that 1 mole 0f [tex]Fe2O3[/tex] and 3 moles of [tex]CO[/tex] produce 3moles of [tex]CO2[/tex].
As given [tex]Fe2O3[/tex] acts as the limiting reagent such that:
Moles of [tex]Fe[/tex] produced = 0.22 mol x (2 mol [tex]Fe[/tex] / 1 mol [tex]Fe2O3[/tex]) = 0.44 mol Fe
Moles of [tex]CO2[/tex] produced = 5.5 mol [tex]CO[/tex] x (3 mol [tex]CO2[/tex]₂ / 1 mol [tex]CO[/tex]) = 16.5 mol
We know the molar mass of compound [tex]CO2[/tex] is and [tex]Fe[/tex] is then,
mass of [tex]Fe[/tex] used = moles x molar mass of [tex]Fe[/tex] = 0.44 x 55.84 = 24.56g
mass of [tex]CO2[/tex] used = moles x molar mass = 16.5 x 44.01 = 726.165g
Hence, 24.56g of [tex]Fe[/tex] and 726.165g of [tex]CO2[/tex] are used in the reaction.
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(a) assume that a neutron traveling at 3.00(103) km/s strikes the nucleus of a motionless 11na23 atom in a reactor core. the collision causes the neutron to recoil elastically, and it travels backward along exactly the same path it traveled as it approached the atom. calculate the velocity of the neutron after the collision. (b) perform the same calculation for a 3.00(103) km/s neutron striking a 3li7 atom nucleus. based on your answers from these two calculations, which metal would perform better for use as coolant in a lmfbr where high neutron velocity is preferred?
(a) The velocity of the neutron after the collision [tex]3.00(10^3)[/tex] km/s.
(b) Different materials may have different properties that make them more or less suitable as coolants in a fast breeder reactor.
(a) In an elastic collision, momentum and kinetic energy are conserved. Let m be the mass of the neutron and M be the mass of the sodium atom. Before the collision, the momentum of the neutron is
p = mv,
where v is the velocity of the neutron.
The momentum of the sodium atom is zero because it is motionless. Therefore, the total momentum before the collision is
[tex]p_{total} = mv[/tex].
After the collision, the neutron recoils backward along exactly the same path it traveled, so its final momentum is
[tex]p_f = -mv[/tex].
By conservation of momentum, the total momentum after the collision is also
[tex]p_{total} = p_f + 0 = -mv[/tex].
Equating the total momentum before and after the collision gives:
[tex]p_{total} = mv = -mv[/tex]
Solving for the final velocity [tex]v_f[/tex] of the neutron, we get:
[tex]v_f = -v = -3.00(10^3)[/tex] km/s
Therefore, the velocity of the neutron after the collision is [tex]3.00(10^3)[/tex] km/s in the opposite direction.
(b) We follow the same procedure as in part (a), but with a lithium atom instead of a sodium atom.
Let M be the mass of the lithium atom.
Before the collision, the momentum of the neutron is
p = mv,
where v is the velocity of the neutron.
The momentum of the lithium atom is zero because it is motionless. Therefore, the total momentum before the collision is
[tex]p_{total} = mv[/tex]
After the collision, the neutron recoils backward along exactly the same path it traveled, so its final momentum is
[tex]p_f = -mv[/tex].
By conservation of momentum, the total momentum after the collision is also [tex]p_{total} = p_f + 0 = -mv[/tex].
Equating the total momentum before and after the collision gives:
[tex]p_{total} = mv = -mv[/tex]
Solving for the final velocity [tex]v_f[/tex] of the neutron, we get:
[tex]v_f = -v = -3.00(10^3)[/tex] km/s
Therefore, the velocity of the neutron after the collision is [tex]3.00(10^3)[/tex] km/s in the opposite direction.
Comparing the results of parts (a) and (b), we see that the type of metal does not affect the velocity of the neutron after an elastic collision. However, different materials may have different properties that make them more or less suitable as coolants in a fast breeder reactor.
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double double toil and trouble fire burn and cauldron bubble are meaning
Double double toil and trouble;
Fire burn and couldron bubble. is by the struggle a lot
option A
The phrases that the three witches in Macbeth used to inform the audience of Macbeth's actions show that Macbeth would suffer greatly. The three witches foretold Macbeth's ascension to the throne. Additionally, they told him that his reign could not be passed on to his descendants. Instead, the realm would pass to Banquo's sons. The predictions a encouraged Macbeth to kill his t friends, including Duncan, in order to fulfill have excessive desires, which Lady Macbeth pushed him to do. As a result, it to clear from the phrases that the three witches in Macbeth used to the inform the audience about Macbeth's activities that Macbeth would face many difficulties.
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The complete question follows
Read the following lines that a group of witches say in Macbeth .What do these lines let the audience know that Macbeth is going to do?
Double double toil and trouble;
Fire burn and couldron bubble.
A) struggle a lot
B) catch fire
C) meet someone who looks like him
D) buy a cauldron
HELP ME ASPPP THANKYOU
Answer:
the second option
Explanation:
an object vibrating at a second objects natural frequency forces the second object to vibrate
What's the difference between a physical change and chemical change? in a quick, short and easy response please!
How much pressure is applied to the ground
by a 105 kg man who is standing on square
stilts that measure 0.04 m on each edge?
Answer in units of Pa.
assume each led has a voltage drop of 1.8 v when fully forward-biased. how much current does this circuit draw? is this a safe level of current for the leds?
Given voltage drop across
EDLED is 1.8V in forward bias.
1.8 1.8 1.8
100
if
3.1kn
Applying Kirchhoff's voltage law to the circuit,
we get 10-1.8-1.8-1.8 - EXLOUD
<= 0=)46= 8×1000 [= 4.6 MA.
It is safe current level for a LED-for typical Current is arand power LED maximum forward 20 mA.
Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light. In brief, voltage = pressure, and it is measured in volts (V).
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a bat flying toward a wall emits a 45000-hz sonar pulse. the pulse is reflected back from the wall and the bat hears the reflected pulse at a frequency of (45000 650) hz. take the speed of sound to be 343 m/s.
The speed of the bat, in meters per second of vbat Is 2.68m/s.
The apparent frequency, I of the Reflected Pulse is.
f = v_s + v_b / v_s - v_b.f_0
∴ 45710 = 343 + v_b / 343 - v_b.(45000)
45710 / 45000 = 343 + v_b / 343 - v_b
= 1.01578
343 + v_b = (1.01578) (343 - v_b)
v_b + (1.01578)v_b = 348.41 - 343
v_b(1 + 1.01578) = 5.41
v_b = 5.41 /(1 + 1.10578) = 5.41 / 2.01578
v_b = 2.68 m/s
Apparent frequency refers to the frequency of a wave as it appears to an observer who is in motion relative to the source of the wave. When an observer is moving towards a sound source, for instance, the frequency of the sound waves appears to be higher, resulting in a higher pitch. Conversely, when the observer is moving away from the source, the frequency appears to be lower, resulting in a lower pitch.
The Doppler effect is applicable to various types of waves, including sound waves, light waves, and electromagnetic waves. It has significant applications in fields such as astronomy, where it is used to measure the movement of celestial bodies, and in medical imaging, where it is used in ultrasound technology.
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Complete Question: -
A bat flying toward a wall emits a 45000-Hz sonar pulse. The pulse is reflected back from the wall and the bat hears the reflected pulse at a frequency of (45000 + 710) Hz. Take the speed of sound to be 343 m/s.
Find the speed of the bat, in meters per second.
vbat =
distinguish between aerobic and anaerobic respiration write any 3points
What is transient simulation in LTspice?
Transient simulation is an analysis is where a parameter such as a voltage or current is plotted against time.
A time domain transient analysis is where a parameter such as a voltage or current is plotted against time. If you are looking at an output you can see the behavior over a specified length of time. For this example we are going simulate the output of a half-wave rectifier.
In a transient simulation, you're looking at how a circuit reacts to a change in its inputs, and how the output eventually transitions between two states. These transitions between output states are not instant, and many applications require a smooth transient response between two states.
Transient analysis allows you to extract the decay constant and the natural resonance frequency from a graph of current or voltage in the time domain. The same idea applies any linear time invariant circuit driven with an arbitrary waveform. These driving sources do not need to be periodic in time.
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an observer is located halfway between two loudspeakers as shown. assume that the two loudspeakers are driven in phase, and the observer hears the same intensity 19.2 w/m2 from each speaker. assume the speed of sound is 340 m/s and the two loudspeakers emit a tone with a frequency of 425 hz. find the minimum distance that the observer has to travel in the x direction (moving toward one speaker and away from the other) to hear the smallest possible sound intensity.
The minimum distance the observer has to travel in the x-direction to hear the smallest possible sound intensity is half of this distance or 0.6 m.
In this scenario, the observer is located at the midpoint between the two loudspeakers, and the two loudspeakers are emitting sound waves with the same frequency and in phase. As a result, the sound waves from each speaker will interfere with each other constructively, creating a region of high sound intensity known as a sound interference pattern.
If the observer moves slightly in either direction along the x-axis, the path difference between the two sound waves will change, causing the interference pattern to shift. This shift will result in a change in the sound intensity heard by the observer.
To find the minimum distance the observer has to travel to hear the smallest possible sound intensity, we can use the concept of destructive interference. Destructive interference occurs when the path difference between the two sound waves is equal to an odd multiple of half the wavelength of the sound wave.
The wavelength of a sound wave with a frequency of 425 Hz can be calculated using the formula:
wavelength = speed of sound / frequency = 340 m/s ÷ 425 Hz = 0.8 m
If the observer moves a distance of x in the x-direction towards one speaker and away from the other, the path difference between the two sound waves will be:
path difference = distance traveled by a sound wave from one speaker - distance traveled by the sound wave from the other speaker
= (x + d/2) - (x - d/2)
= d
where d is the distance between the two speakers.
To create destructive interference, the path difference should be equal to an odd multiple of half the wavelength:
d = (2n+1) × wavelength / 2
where n is an integer.
Since we want to find the minimum distance x, we want to find the smallest value of n that satisfies this equation.
The smallest possible sound intensity occurs when the two sound waves interfere destructively, resulting in a sound wave with zero amplitude. Therefore, we want to find the value of n that corresponds to destructive interference.
For destructive interference, n must be an odd integer. The smallest odd integer that satisfies the above equation is n = 1. Substituting this value into the equation and solving for d, we get:
d = (2n+1) × wavelength / 2 = 3/2 × wavelength = 1.2 m
Therefore, the minimum distance the observer has to travel in the x-direction to hear the smallest possible sound intensity is half of this distance, or:
x = d / 2 = 0.6 m.
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for a system in thermal contact with a heat reservoir at a fixed temperature t, fixedvolume v , and fixed number of particles n, what is the probability of finding thesystem in a particular microstate?
A system has an equal chance of being in any microstate that corresponds to its current macrostate. Equilibrium is defined as an isolated system that meets the postulate of equal a priori probabilities.
The probability of discovering a system in a specific microstate is simply one divided by the total number of microstates.
The thermodynamic probability (denoted by W) is equal to the number of microstates that realise a given macrostate, so W = 1.
To put it simply, the microcanonical ensemble is defined as assigning an equal probability to every microstate whose energy falls within a range centred on E. The probability of all other microstates is set to zero.
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convert86400secs into day
Answer:
86400 seconds is equal to 1 day.
Explanation:
a triangular hiking trail is being planned. at an average walking speed of 2 m/s, how many minutes will it take a hiker to make a complete circuit around the trail? round to the nearest minute
The time taken by hiker is L/60 minutes (L = length of trail)
However, we can show the steps to find the answer if we have the length of the trail.
Let's assume that the length of the hiking trail is L meters. To make a complete circuit around the trail, the hiker needs to cover a distance of 2L meters (going up and coming back down).
If the hiker's average walking speed is 2 m/s, then the time taken to cover a distance of 2L meters can be calculated using the formula:time = distance / speed
Plugging in the values, we get:time = (2L meters) / (2 m/s) = L seconds
To convert seconds to minutes, we divide by 60:time in minutes = L seconds / 60
If we knew the length of the trail in meters, we could calculate the time taken in minutes using this formula.
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The crests on a long surface waterwave are 20m apart and in 1 minute 10 crests pass by. What is the speed of this wave
The speed of this surface water wave is 3.33 meters per second.
The speed of a surface water wave depends on the wavelength and the frequency of the wave.
The speed of a surface water wave can be determined by the equation:
speed = wavelength × frequency
Here, the wavelength is given as 20 meters (the distance between two successive crests), and the frequency can be calculated by dividing the number of crests passing by in one minute (60 seconds) by the time taken for them to pass:
frequency = 10 crests / 1 minute = 10/60 Hz = 1/6.0 Hz
Put values:
speed = 20 meters × (1/6.0 Hz) = 3.33 meters/second
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a ball is thrown upward with an initial vertical speed of 46 m/s. the ball rises and falls to land on a 30 m tall tower. what speed does the ball have just before it lands on the tower? ignore air resistance.
The speed of the ball just before its land on the 30 tall Tower is 39.08m/s.
The ball is thrown vertically upward with an initial vertical speed of 46 m/s the ball rises and falls to land on a 30 m tall Tower.
First letters find out the maximum height of the ball by using the formula,
H = u²/2g
Where, H is height, u is initial speed, g is acceleration due to gravity.
Putting values,
H = 46×46/(2×9.8)
H = 107.95 m.
Now when the ball reaches the maximum height and lands on the 30 metre tall Tower it covers a distance d of 77.95 m.
Now, using this distance we can find the speed of the ball just before it lands on the tower by using the formula,
V = √(2gd)
V = √(2×9.8×77.95)
V = √(1527.82)
V = 39.08m/s.
So, the speed of the ball just before it lands on the tower is 39.08m/s.
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50 kg box rests on a frictionless horizontal surface. Force acts on it and changes its speed to 25 m/s in 5 s, then find the value of force.
Force acts on it and changes its speed to 25 m/s in 5 s, then the value of force will be 250N.
Force: What is it?
The interaction between two objects, which can accelerate an object's motion, is described by the physical quantity force. In the International System of Units (SI), the Newton (N) is its standard unit of measurement.
We can use Newton's second law of motion, which states that the force acting on an object is equal to the object's mass divided by its acceleration, to determine the force's value. In this instance, the box has a starting speed of 0 m/s and a final speed of 25 m/s, which it reaches in 5 seconds. As a result, the box accelerates to:
a = (v_f - v_i) /t
= (25 m/s - 0 m/s) / 5 s
= 5 m/s²
There is no force produced by friction because the box is on a smooth surface. As a result, the only force exerted on the box is the force applied (F). The value of F can now be determined using Newton's second law of motion:
F = m × a
= 50 kg × 5 m/s²
= 250 N
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describe the relationship between frequency and energy as you move through all parts of the electromagnetic spectrum.
In electromagnetic spectrum, the frequency and energy of electromagnetic waves increase.
The electromagnetic spectrum includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. At the lowest end of the spectrum, radio waves have low frequency and low energy, while at the highest end, gamma rays have high frequency and high energy.
The relationship between frequency and energy can be described by the equation E = hf, where E is energy, h is Planck's constant, and f is frequency. As frequency increases, energy increases proportionally, and this relationship is consistent throughout the electromagnetic spectrum.
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In practical situations, when an electric appliance is connected to a known voltage source, then how does the heating effect of electric current can be calculated?
