To solve this problem, we can use the law of conservation of momentum, which states that the total momentum of a system before a collision is equal to the total momentum of the system after the collision.
The equation for conservation of momentum is:
m1v1 + m2v2 = m1v1' + m2v2'
Where:
m1 = mass of object 1 (2 kg)
v1 = velocity of object 1 before collision (3.5 m/s)
m2 = mass of object 2 (3 kg)
v2 = velocity of object 2 before collision (2.5 m/s)
v1' = velocity of object 1 after collision (unknown)
v2' = velocity of object 2 after collision (5.0 m/s)
Plugging in the given values, we get:
(2 kg)(3.5 m/s) + (3 kg)(2.5 m/s) = (2 kg)(v1') + (3 kg)(5.0 m/s)
Simplifying, we get:
7 + 7.5 = 2v1' + 15
14.5 = 2v1'
v1' = 7.25 m/s
Therefore, the final speed of the 2 kg block after the collision is 7.25 m/s.
answer: the final speed of the 2 kg ball is 0.25 m/s.
explanation:
To solve this problem, we can use the law of conservation of momentum, which states that the total momentum of a system before a collision is equal to the total momentum after the collision.
The momentum of an object is defined as the product of its mass and velocity:
momentum = mass x velocity
So, the total momentum before the collision can be calculated as:
total momentum before = (mass of ball 1 x velocity of ball 1) + (mass of ball 2 x velocity of ball 2)
total momentum before = (2 kg x 3.5 m/s) + (3 kg x 2.5 m/s)
total momentum before = 7 kg m/s + 7.5 kg m/s
total momentum before = 14.5 kg m/s
After the collision, the 3 kg ball moves at 5.0 m/s in its original direction. Let's assume that the 2 kg ball moves at a final velocity of v.
Using the law of conservation of momentum, we can write:
total momentum after = (mass of ball 1 x final velocity of ball 1) + (mass of ball 2 x final velocity of ball 2)
total momentum after = (2 kg x v) + (3 kg x 5.0 m/s)
total momentum after = 2v kg m/s + 15 kg m/s
Since the total momentum before the collision is equal to the total momentum after the collision, we can set these two expressions equal to each other:
total momentum before = total momentum after
14.5 kg m/s = 2v kg m/s + 15 kg m/s
Solving for v, we get:
v = (14.5 kg m/s - 15 kg m/s) / 2 kg
v = -0.25 m/s
Since the final velocity cannot be negative, we know that the 2 kg ball is moving in the opposite direction after the collision. So, we can take the absolute value of v to find the final speed of the ball:
final speed = |v| = |-0.25 m/s| = 0.25 m/s
Therefore, the final speed of the 2 kg ball is 0.25 m/s.
thomas edison was the first to create a portable motion picture camera and projection system. true false
True. Thomas Edison was the first to create a portable motion picture camera and projection system in 1889.
The Kinetograph was the name of the first movie camera. It was the first camera that could capture moving images on a strip of film. George Eastman (later of Eastman Kodak Camera) created celluloid film in 1889, which was utilized in Edison's Kinetoscope and Kinetograph.
Edison developed the camera as well as its viewer and put on multiple demonstrations of his invention. The first still photographers, Joseph Nicephone Niepce and Louis Daguerre of France, were responsible for discovering the photographic principles upon which the camera was founded. His invention, known as the Kinetoscope, consisted of a camera, film, and projection system.
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a ladybug walks around a circular track that has a diameter of 3 m. if it moves around the entire track for at an angular velocity of 5 rad/s for 12s, what is the angular displacement? what is angular acceleration? lab
The angular acceleration of a ladybug walks around a circular track that has a diameter of 3 m is 0.625 rad/s².The angular displacement is 60 rad.
Given that,The diameter of the circular track = 3m,Angular velocity of the ladybug = 5 rad/s.The time for which the ladybug moves = 12s. The formula for angular displacement is given by:
angular displacement = angular velocity × time (in seconds) = 5 rad/s × 12 s = 60 rad
So, the angular displacement is 60 rad.The formula for angular acceleration is given by:
angular acceleration = change in angular velocity / time taken (in seconds)
The initial angular velocity of the ladybug is zero, since it was at rest initially.The final angular velocity of the ladybug can be found using the formula:v = r × ωwhere,v = final linear velocity,r = radius of the circular track = 1.5m, ω = angular velocity= 5 rad/sv = 1.5 × 5 = 7.5 m/s
Therefore, the final angular velocity of the ladybug is 7.5 m/s.The change in angular velocity is given by:change in angular velocity = final angular velocity - initial angular velocity= 7.5 rad/s - 0 rad/s= 7.5 rad/s.The time taken for the ladybug to reach its final velocity is 12 seconds.Hence, the angular acceleration is given by:
angular acceleration = change in angular velocity / time taken (in seconds) = 7.5 rad/s / 12 s = 0.625 rad/s²
Therefore, the angular acceleration is 0.625 rad/s².
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kayla has two magnets. she would like to know how much magnetic energy is stored in each one. what would be the best way for her to determine which magnet has the most magnetic energy?
Kayla can determine which magnet has the most magnetic energy by performing an experiment using a magnetic pendulum.
What is a magnet?
A magnet is an object that has a magnetic field surrounding it. The magnetic field is what allows magnets to attract or repel other magnets. Magnets can be natural or man-made. A magnetic pendulum is a simple device that consists of a magnet hanging on a string.
When the magnet is brought near to another magnet, it will either be attracted or repelled. By measuring the amount of force required to move the magnet, Kayla can determine which magnet has the strongest magnetic field and therefore the most magnetic energy.
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1.
(a)
Beams of red light of wavelength 700 nm and green light of wavelength 550 nm are incident
normally on a diffraction grating which has 5000 lines per cm. Bright spots (maxima) are
observed on a distant screen.
LIT
(i) State one use of a diffraction grating.
You can use it in microwaves
(ii) Show clearly that the grating spacing, d is 2.0 x 10 m.
20×10....
(iii)
53-9°
Show clearly which of the two colours would give a second order maximum at an
angle of diffraction between 33° and 34°.
131
11 S
LIT
wavelength....
The green light of wo
give a second order maximum because
It has a shorter wavelength so the
diffraction will meet on the obstacks.
(b) (i) Show that the maximum order possible is given by
d
2
275
would
121
Del
(ii) Determine the maximum order for
(I) the green light,
550 =
2
(II) the red light.
700nm
3.50
2
Assuming that the diffracted beams from both lights only overlap at n = 0, determine
the total number of bright spots which can be observed.
Nu
A diffraction grating can be used, for example, to divide light into its many wavelengths or colours, enabling spectroscopic examination. We have the following by applying the grating spacing formula, d = 1/N, where N is the number of lines per unit length:
When red light with a wavelength of 625 nm generally incident?Normally, red light with a wavelength of 625 nm is impinge on an optical diffraction grating with a line density of 2 105 m
Is a diffraction grating typically the site of an electromagnetic wave incident?A diffraction grating often experiences an electromagnetic wave impinge on it. A second-order maximum is generated at a 30° angle to the grating's normal. There are 5000 lines per cm on the grating.
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a 10 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long. there is no appreciable friction between the nail and the string. if the tension in the string is 51 n while the mass moves in a uniform circle on the table, how long does it take for the mass to make one complete revolution?
The time it takes for the 10 kg mass to make one complete revolution on the table, given a tension of 51 N in the string, is 1.6 seconds. This value is calculated using the formula [tex]T = 2π√(r/g)[/tex] where r = 1.3 m and g = 9.8 m/s^2.
When a 10 kg mass is connected to a nail on a frictionless table by a massless string 1.3 m long, and the tension in the string is 51 N, the mass moves in a uniform circular motion. To find the time it takes for the mass to make one complete revolution, we use the formula [tex]T = 2π√(r/g)[/tex], where T is the time period, r is the radius of the circular path, and g is the acceleration due to gravity. Since the motion is on a table, the acceleration is zero and we can use the formula as is, with r = 1.3 m and [tex]g = 9.8 m/s^2[/tex]. Substituting these values, we get T = 1.6 seconds. Therefore, it takes 1.6 seconds for the mass to make one complete revolution on the table.
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lobster traps are designed so that a lobster can easily get in, but cannot easily get out. can a diathermic wall be created that allows heat to flow through in one direction only? explain.
Lobster traps are designed so that a lobster can easily get in but cannot easily get out. It is possible to create a diathermic wall that allows heat to flow through in one direction only. Diathermic walls are barriers that permit heat to flow through them in both directions.
Such walls are used in industrial applications to separate hot and cold regions of a system or for temperature control. However, it is possible to create a diathermic wall that allows heat to flow through in only one direction.
Heat moves from hot to cold regions in nature due to the second law of thermodynamics. However, if the diathermic wall is made up of alternate layers of high- and low-conductivity materials, heat will flow more quickly in one direction than in the other.
The side with the high-conductivity material will have a lower temperature than the side with the low-conductivity material. This temperature difference generates an electric current that opposes the flow of heat in the opposite direction, effectively blocking it.
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when he displacement of a mass on a spring is half the amplitude of the oscillation, what fraction of the mass's energy is kinetic energy?
Answer:
PE = 1/2 K x^2 potential energy
when x = A
PEt = 1/2 k A^2 total potential energy
If x = A / 2
PE 1/2= 1/2 k A^2 / 4
PE1/2 / PEt = 1/4
Thus the PE at 1/2 the displacement is 1/4 the total
Since PE + KE = constant
3/4 the mass's energy will be KE at 1/2 the amplitude
a satellite in a circular orbit around earth experiences a centripetal acceleration of 8.62 m/s2 . the tangential speed of the satellite is 7.65 x 103 m/s. the radius of earth is 6.38 x 106 m. what is altitude of the satellite?
The altitude of the satellite is 2.24 × 10⁷ m.
Given, the centripetal acceleration of the satellite is a = 8.62 m/s²,
the tangential speed of the satellite is v = 7.65 × 10³ m/s,
the radius of the earth is R = 6.38 × 10⁶ m
We can find the altitude (h) of the satellite from the relation;
a = (v² / R) + (v² / h)
where, v is the tangential velocity, R is the radius of the Earth, h is the altitude of the satellite
Substitute the given values to calculate h;
a = (v² / R) + (v² / h)
8.62 = (7.65 × 10³)² / (6.38 × 10⁶) + (7.65 × 10³)² / h
h = (7.65 × 10³)² / (8.62) - (6.38 × 10⁶)h = 2.24 × 10⁷ m
Therefore, the altitude of the satellite is 2.24 × 10⁷ m.
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pilar is playing with a remote-controlled toy boat in a lake. she navigates the boat 400 m away from herself, keeping it at a constant speed. steering it back toward herself, pilar navigates the boat over the same route and at the same speed for 2 minutes, and then she increases the boat's speed by 10 m/min. the return trip is 60 seconds faster. how long does the return trip take?
Pilar is playing with a remote-controlled toy boat in a lake. she navigates the boat 400 m away from herself, keeping it at a constant speed, the return trip takes 3 minutes.
To find the time it takes for the return trip:
On the initial trip away from herself, Pilar navigates the boat 400 m away, which takes:
Time = Distance / Speed
= 400 m / v m/min
= 400/v min
1. The time for the first 2 minutes of the return trip at the same speed:
Time = 2 min
2. The time for the remaining distance at the increased speed:
The increased speed is "v + 10" m/min. The time for this segment is given as 60 seconds (1 minute) less than the initial trip:
Time = (400 m) / (v + 10) m/min
= (400/v - 1) min
The total time for the return trip is the sum of the time for the two segments:
Total time = 2 min + (400/v - 1) min
Now,
Total time = 2 min + (400/v - 1) min
= 60 seconds faster than the initial trip
Since 60 seconds is equal to 1 minute, we have:
Total time = 2 min + (400/v - 1) min = 2 min + 1 min
Simplifying the equation:
400/v - 1 = 1
400/v = 2
v = 400/2
v = 200 m/min
So,
Total time = 2 min + (400/v - 1) min
Total time = 2 min + (400/200 - 1) min
Total time = 2 min + (2 - 1) min
Total time = 2 min + 1 min
Total time = 3 min
Thus, the return trip takes 3 minutes.
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a photon undergoing compton scattering has an energy after scattering of 80 kev, and the electron recoils with an energy of 25 kev. find the wavelength of the incident photon. find the angle at which the photon is scattered. find the angle at which the electron recoils.
The wavelength of the incident photon is 2.48 x [tex]10^{-11}[/tex] m. The angle at which the photon is scattered is 0.24 radians. And the angle at which the electron recoils is 0.48 radians.
Calculating the Wavelength of the Incident Photon:
The wavelength of the incident photon can be calculated using the equation
λ = h/p, where h is Planck's constant and p is the momentum of the photon.
The momentum of the incident photon can be calculated using the equation p = E/c, where E is the energy of the incident photon and c is the speed of light.
Therefore, substituting the energy of the incident photon (80 keV) in the equation, we can calculate the momentum of the incident photon:
p = 80 keV/ (3 x [tex]10^8[/tex] m/s) = 2.67 x [tex]10^{-24}[/tex] kg.m/s
Therefore, the wavelength of the incident photon can be calculated using the equation:
λ = h/p
= 6.63 x [tex]10^{-34}[/tex] J.s/ (2.67 x [tex]10^{-24}[/tex] kg.m/s )
= 2.48 x [tex]10^{-11}[/tex] m
Calculating the Angle at which the Photon is Scattered:
The angle at which the photon is scattered can be calculated using the Compton scattering equation, which is
Δθ = (h/mc) (1 - cos θ),
where Δθ is the change in the angle of the photon's trajectory, h is Planck's constant, m is the mass of the electron, and θ is the angle at which the photon is scattered.
The mass of the electron can be calculated using the equation m = [tex]E/c^2[/tex], where E is the energy of the electron and c is the speed of light.
Therefore, substituting the energy of the electron (25 keV) in the equation, we can calculate the mass of the electron:
m = 25 keV/ (3 x [tex]10^8[/tex] [tex]m/s)^2[/tex]
= 8.33 x [tex]10^{-36}[/tex] kg
Therefore, the angle at which the photon is scattered can be calculated using the Compton scattering equation:
Δθ = (h/mc) (1 - cos θ)
= (6.63 x [tex]10^{-34}[/tex] J.s/ (8.33 x [tex]10^{-36}[/tex] kg) (1 - cos θ)
= 0.24 radians.
Calculating the Angle at which the Electron Recoils:
The angle at which the electron recoils can be calculated using the equation θ = 2Δθ,
where Δθ is the change in the angle of the photon's trajectory.
Therefore, substituting the value of Δθ (0.24 radians) in the equation, we can calculate the angle at which the electron recoils:
θ = 2Δθ
= 2 x 0.24
= 0.48 radians.
Thus, the wavelength of the incident photon is 2.48 x [tex]10^{-11}[/tex] m, the angle at which the photon is scattered is 0.24 radians, and the angle at which the electron recoils is 0.48 radians.
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According to Huygens’ wave theory, every point on the wavefront behaves as a source of (A) secondary waves (B) stationary waves (C) surface waves (D) beatsRead more on Sarthaks.com - https://www.sarthaks.com/1200121/according-huygens-wave-theory-every-point-the-wavefront-behaves-source-secondary-waves
According to Huygens’ wave theory, every point on the wavefront behaves as a source of secondary waves.
What is Huygens' wave theory?Christiaan Huygens, a Dutch mathematician and physicist, created the Huygens' wave theory. It's a hypothesis that light waves can be seen as tiny wavefronts that are each a spherical wave. According to Huygens, every point on a given wavefront acts as a secondary source of waves in Huygens' wave theory. Huygens' wave theory states that every point on a wavefront behaves as a source of secondary waves.
The Huygens' principle or Huygens-Fresnel principle states that light waves are generated from every point on a wavefront. It specifies that each point on a wavefront serves as a secondary source of spherical waves. This theory enables researchers to determine how light waves move and the laws that govern their propagation.
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A 22 kg child is riding a 5.8 kg bike with a velocity of 4.5 m/s to the northwest. A) what is the total momentum of the child and the bike together? Answer in units of kg • m/s.
B) What is the momentum of the child? Answer in units of kg • m/s.
Total kinetic energy of a ostrich/child/bike is given by ptotal (= postrich + pchild/bike => 27.8 kg/m/s - 4.5 kg/m/s = 23.3 kg/m/s (in J). A body with mass m kg travelling at a speed of v m/s has momentum M = m*v kg*m/s.
So what is a good example of momentum in plain language?Momentum can be thought of as a brain's "power" or the force that it can apply to another body while it is moving. For instance, a bowling ball with a heavy mass that is moving very slowly (low velocity) may have the same momentum as a baseball with a little mass that is thrown swiftly (high velocity).
Which moves forward more, a car or a truck?More force is being applied to the truck than to the automobile. In motion, inertia is referred to as momentum. Momentum is calculated as the sum of an entity's mass and velocity. A tow van has far more momentum compared to a car driving at the exact same speed due to its increased weight.
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the mean lifetime of an electronically excited state in a molecule is 5 ns. if this state emits at 500 nm, calculate the uncertainty in the emitted wavelength
The uncertainty in the emitted wavelength is approximately: 0.013 nm.
The mean lifetime of an electronically excited state in a molecule is 5 ns. If this state emits at 500 nm, calculate the uncertainty in the emitted wavelength.
The uncertainty in the emitted wavelength can be calculated using the relation given below,Δλ = h/(4πmc)τ
Here, Δλ is the uncertainty in the emitted wavelength is Planck’s constant
m is the mass of an electron
c is the speed of light in vacuum
t is the lifetime of the excited state
Therefore, substituting the given values we have,Δλ = (6.626 × 10^-34)/(4π × 9.1 × 10^-31 × 3 × 10^8 × 5 × 10^-9)≈ 0.013 nm (approximately)
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all other things being equal, would a lens with a short focal length or a long focal length be better as a fire starter? drag the terms on the left to the appropriate blanks on the right to complete the sentences. resethelp smaller focal length lens creates an image that is blank bright.target 1 of 2 to burn fire we need high light intensity, hence we need the image to be brighter, that means the lens with blank focal length will be more effective.
A lens with a shorter focal length is better as a fire starter because it creates an image that is brighter. To burn a fire, we need a high light intensity. This means that the lens with a smaller focal length will be more effective.
Shorter focal length lenses create a bright, highly focused light beam which is ideal for a fire starter. A longer focal length lens produces a dimmer and more spread out light beam which would not be suitable for this purpose. When using a shorter focal length lens, the light is focused more narrowly and with more intensity, creating the necessary light intensity needed to start a fire.
Shorter focal length lenses also typically have larger apertures which allow more light to pass through the lens, resulting in a brighter image. Additionally, a shorter focal length lens also has a wider field of view which allows more light to enter the lens. This further contributes to the brightness of the image.
In conclusion, when all other things are equal, a lens with a shorter focal length is better as a fire starter because it creates a brighter image that has the necessary light intensity needed to start a fire. The wider field of view and larger aperture of a shorter focal length lens allows more light to pass through and create a brighter image.
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5. 7.0 tons of coal are burned to generate 3.6 x 104 kwh of electricity. what is the efficiency of the generator? answer
The efficiency of generator when 7.0 tons of coal are burned to generate 3.6 x 10^4 kwh of electricity is 74.1%.
The efficiency of the generator is the ratio of the useful output of energy to the input of energy. It is a measure of how much of the energy that is put into a system actually gets transformed into useful output energy.
To calculate the efficiency, we need to determine the useful energy output and the energy input. Then we can find the efficiency by dividing the useful energy output by the energy input.
Given that 7.0 tons of coal are burned to generate 3.6 x 10^4 kwh of electricity.
Here, we have to find the efficiency of the generator.
We need to convert the given tons of coal into joules.
1 ton of coal = 2.5 x 10^10 J
So,7.0 tons of coal = 7.0 x 2.5 x 10^10 J = 1.75 x 10^11 J
The input energy is 1.75 x 10^11 J
Useful output energy is given as 3.6 x 10^4 kWh.
We need to convert kWh into joules.
1 kWh = 3.6 x 10^6 J
Therefore, 3.6 x 10^4 kWh = 3.6 x 10^4 x 3.6 x 10^6 J = 1.296 x 10^11 J
The efficiency of the generator is given as
Efficiency = (Useful output energy / Input energy) x 100
Substituting the values, we get,
Efficiency= (1.296 x 10^11 / 1.75 x 10^11) x 100= 0.741 x 100= 74.1%
Therefore, the efficiency of the generator is 74.1%.
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Which one of the following is an electronic system used by the NYSE for directly transmitting orders to designated marktet makers? O Pillar system O Garage order flow O Big Room system O Order NET SLP network
The electronic system used by the NYSE for directly transmitting orders to designated market makers is the Pillar system (option A).
The Pillar system is an electronic trading platform used by the New York Stock Exchange (NYSE) that enables direct transmission of orders from traders to designated market makers. The system is designed to improve speed, reliability, and efficiency of trading by automating the process of order routing and execution.
The Pillar system replaces the NYSE's previous trading platform, the NYSE Classic, and was introduced in 2017 as part of the exchange's efforts to modernize and streamline its operations. The system is intended to provide a more seamless and integrated trading experience for market participants.
Option A is the correct answer.
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The weight of a dum bell is 500 n. It is lifted over a bodybuilder’s head at a distance of 0.7 meters. What is the work done by the bodybuilder on the dum bell?
350 J
714.2 J
500 J
1.4 x 10-3 J
Explanation:
W = F * d <==== ( Force * distance)
500 N * .7 m = 350 J
9. what must the orbital height (above the surface) of a satellite that is in geosynchronous with a point on the earth's equator?
A geosynchronous satellite must be in an orbit with a height of approximately 35,786 km (22,236 miles) above the surface of the Earth at the equator.
This height is referred to as the "geosynchronous orbital height" or the "Clarke orbit". In order for a satellite to be in geosynchronous with a point on the Earth's equator, it must have an orbital height of approximately 35,786 kilometers above the Earth's surface.
What is Geosynchronous?Geosynchronous is a term that refers to an orbit in which a satellite orbits the Earth at the same rate as the Earth rotates. As a result, the satellite appears to remain in a fixed position relative to an observer on the ground. Satellites that are placed in geosynchronous orbit are used for a variety of purposes, including communications, meteorology, and remote sensing. They're also useful for military purposes.
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a softball of mass 0.220 kg that is moving with a speed of 4.0 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. afterward the incoming softball bounces backward with a speed of 2.0 m/s. calculate the velocity of the target ball after the collision.
The velocity of the target ball after the collision will be 1.32 / m².
Velocity of the target ball after the collision = (m1u1 + m2u2) / (m1 + m2)
Here, m1 = mass of the incoming softball = 0.220 kgm² = mass of the target ball = ?
u1 = initial velocity of the incoming softball = 4.0 m/su2 = initial velocity of the target ball = 0 m/sv1 = final velocity of the incoming softball = -2.0 m/s (because the incoming softball is bouncing backward)
v2 = final velocity of the target ball = ?
Substituting the given values in the above formula, we get:
v2 = (m1u1 + m2u2 - m1v1) / m2v2 = (0.220 x 4.0 + 0 x 0 - 0.220 x (-2.0)) / m2v2 = (0.880 + 0.440) / m2v2 = 1.32 / m²
Therefore, the velocity of the target ball after the collision is 1.32 / m².
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if 54 j of work are needed to stretch a spring from 14 cm to 20 cm and 90 j are needed to stretch it from 20 cm to 26 cm, what is the natural length of the spring?
The natural length of the spring is 17 cm. Given that a 54J of work is needed to stretch a spring from 14 cm to 20 cm and 90J of work is needed to stretch it from 20 cm to 26 cm.
Let L be the natural length of the spring.
Initial length of the spring = 14 cmFinal length of the spring = 26 cmTotal energy required to stretch the spring from natural length to 26 cm = 54 + 90 = 144 J
Total extension of the spring = (26 - L) cmTotal energy required to stretch the spring from natural length to 20 cm = (54 / 144) × 90 = 33.75 J
Total extension of the spring = (20 - L) cm
Now we need to equate the total extensions of the spring to find the natural length of the spring.(20 - L) + (26 - L) = 12cm46 - 2L = 12L = 17 cm
Therefore, the natural length of the spring is 17 cm.
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While the platform is rotating, the hanging mass remains attached to the test mass and is not removed from the platform. - True - False
False is the proper response. The magnitude of velocity is constant in a uniform circular motion. Therefore, the assertion is true.
How does the frequency or number of revolutions change when the washer's bulk rises?
The frequency increased with increasing bulk. The second formula can also be used to describe this relationship. The equation demonstrates the direct connection between acceleration and mass in the presence of constant load and diameter. The outcome is that an increase in mass causes an increase in velocity.
A uniformly moving item has a centripetal force that is constantly directed toward the center of the circle it is traveling in. When the applied circular path force is released, the item will travel on a single direction parallel to the curving route at a certain location.
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The sun appears larger than other visible stars because it is ______ than they are.
brighter
bigger
hotter
closer
The sun appears larger than other visible stars because it is closer than they are.
The sun appears larger than other visible stars because it is closer than they are. The Sun is a star that is found at the center of our Solar System. The Sun contains around 99.86% of the total mass of the Solar System. The Sun is also known as Sol, which is the source of life for our planet. The Sun is the brightest object in our Solar System.
The sun appears larger than other visible stars because it is closer than they are. Although the sun is one of the smallest stars in the universe, it appears larger and brighter than any of the other visible stars in the sky because it is closer to the Earth than any of the other stars. This is due to the fact that the Sun is the nearest star to the Earth, and as a result, it appears larger and brighter than any of the other visible stars.
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jet is flying due north relative to the ground the speed of the jet relative to the ground is 155 m s the wind at the jet's altitude is 40.0 m s toward the northeast 45.0 north of east suppose that the x axis is directed eastward and the y axis is directed northward find the speed of the jet relative to the air its airspeed
The velocity of the jet relative to the air (its airspeed) is 156 m/s to the east.
We can solve this problem using vector addition. Let the velocity of the jet relative to the air be represented by vector A, and the velocity of the wind relative to the ground be represented by vector B.
The velocity of the jet relative to the ground is the vector sum of vectors A and B. We can find the magnitude and direction of vector A by using the Pythagorean theorem and trigonometry:
A² + B² = C²
where C is the magnitude of the velocity of the jet relative to the ground:
C = √(A² + B²) = √((155 m/s)² + (40.0 m/s)²) = 162 m/s
The direction of vector A can be found using the tangent function:
tan θ = B/A
where θ is the angle between vector A and the x-axis:
θ = tan⁻¹(B/A) = tan⁻¹((40.0 m/s)/(155 m/s)) = 14.1° north of east
Therefore, the velocity of the jet relative to the air (its airspeed) is:
A = C*cos(θ) = (162 m/s)*cos(14.1°) = 156 m/s to the east
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footballer shoots ball has mass (m) with force (F), ball gains velocity from force its value is 6m/s. the ball stops after 10sec. So magnitude of momentum of ball after 3.333 sec. is....... kg.m/sec. ( choose the best answer)
3m
4m
6m
8m
The magnitude of momentum of the ball after 3.333 sec is 10F/3 kg.m/sec. None of the options provided match this answer exactly.
What is Momentum?
Momentum is a physical property of an object that describes its motion. It is defined as the product of an object's mass and velocity, and it is a vector quantity, which means it has both magnitude and direction.
The magnitude of momentum of the ball after 3.333 sec can be calculated using the equation:
p = m * v
where p is momentum, m is mass, and v is velocity.
Given that the ball gains a velocity of 6m/s from the force and stops after 10 seconds, we can calculate the mass of the ball as:
v = F * t / m
6 = F * 10 / m
m = 10F / 6
m = 5F / 3
Now, we can calculate the momentum of the ball after 3.333 sec using the above equation:
p = m * v
p = (5F / 3) * (6 * 3.333 / 10)
p = (5F / 3) * 2
p = 10F / 3
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given that organic molecules need to react in order to produce life, this suggests we should search for worlds in the solar system that have a. rocky surfaces b. an atmosphere c. organic molecules on their surfaces d. either an atmosphere, or a surface or subsurface liquid medium such as water, or both.
Given that organic molecules need to react in order to produce life, this suggests we should search for worlds in the solar system that have:
A rocky surface, as these surfaces provide the solid foundation needed for the organic molecules to bond and react together.An atmosphere, as this provides the organic molecules with the air needed for their reactions.Organic molecules on their surfaces, as these molecules are necessary for life to form.Either an atmosphere, or a surface, or subsurface liquid media such as water, or both, as these are necessary components for the reactions of organic molecules to take place.
Organic molecules are chemical compounds that include carbon and hydrogen atoms that are produced by living organisms. These molecules play a crucial role in the formation of life on Earth. Life on Earth began about 4 billion years ago with the formation of organic molecules in the oceans. In the search for life beyond Earth, scientists are searching for signs of organic molecules in other worlds in the solar system.
There are several criteria for finding life on other planets. The first criterion is that the planet must have either an atmosphere, or a surface or subsurface liquid media such as water, or both. This is because organic molecules need to react in order to produce life. Without an atmosphere or a liquid medium, the organic molecules will not react, and life cannot form.
The second criterion is that the planet must have organic molecules on its surface. Organic molecules can be produced by living organisms, or they can be produced by non-living processes such as meteorite impacts or volcanic activity. If organic molecules are found on the surface of a planet, it suggests that the planet has the potential to support life.
Therefore, we should search for worlds in the solar system that have either an atmosphere, or a surface or subsurface liquid media such as water, or both.
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which is more likely to interfere with compass readings, ac current in your refrigerator or dc current when you start your car? explain.
AC current in your refrigerator is more likely to interfere with compass readings than DC current when you start your car.
Compass readings are interfered with by the magnetic fields that AC current and DC current generate. AC current generates a continuous magnetic field that oscillates, while DC current generates a steady magnetic field. Because of the oscillations, AC magnetic fields are much more likely to interfere with a compass than DC magnetic fields.
AC current's magnetic field is of greater intensity and flux density than DC current. The magnetic field generated by a refrigerator's AC motor is one of the main sources of electromagnetic interference that can disturb magnetic compass readings, particularly those in automobiles.
AC motors use a lot of energy, which produces magnetic fields that can interfere with the compass readings. The electrical system of a car uses DC, which generates a relatively steady magnetic field. When a car's engine is started, the battery is subjected to high levels of electrical noise, which can affect other electrical systems in the vehicle.
However, the interference produced is not strong enough to affect the compass reading when compared to the magnetic field produced by the AC motor in a refrigerator.
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a person puts a bottle of juice in a refrigerator. the juice gets cooler while it is in the refrigerator. as the juice gets cooler, what happens to the amount of energy the juice has?
This occurs when airborne water vapour bumps up against the surface of a cold water bottle, causing the water vapour to condense into droplets.
What elements influence the transport of heat between warm and cool substances?The heat transported to or from a substance depends on three things, according to experiments: the change in temperature of the substance, its mass, and some physical characteristics associated to its phase.
What mechanism moves thermal energy from a colder to a warmer area?Examples of heat engines that move energy from a cold place to a hot area include refrigerators and heat pumps.
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The wavelenght of a balmer series line for hydrogen is found to be 656. 5nm. What percentage difference is found between this and the wavelenght predicted by?
There is a 34.9% difference between the observed wavelength and the predicted wavelength for the Balmer series line of hydrogen.
The Balmer series refers to the set of spectral lines in the visible part of the electromagnetic spectrum that are emitted by excited hydrogen atoms when they transition from higher energy levels to the second energy level. The formula for calculating the wavelength of the Balmer series lines is given by:
1/λ = [tex]R_H (1/2^2 - 1/n^2)[/tex]
where λ is the wavelength of the spectral line, R_H is the Rydberg constant for hydrogen [tex](1.0974 * 10^7 m^-1)[/tex], and n is an integer greater than 2 that represents the higher energy level from which the electron transitions.
For the Balmer series line with a wavelength of 656.5 nm, we can calculate the predicted wavelength using the formula above with n=3:
1/λ_predicted = [tex]R_H (1/2^2 - 1/3^2)[/tex]
[tex]= 1.0974 * 10^7 m^{-1} (1/4 - 1/9)[/tex]
= 4.862 x 10^-7 m[tex]= 4.862 * 10^{-7} m[/tex]
= 486.2 nm
The percentage difference between the predicted and observed wavelengths can be calculated using the formula:
% difference = |(observed wavelength - predicted wavelength) / predicted wavelength| x 100%
% difference = |(656.5 nm - 486.2 nm) / 486.2 nm| x 100%
= 34.9%
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14.
a) The concept of the photon was important in the
development of physics throughout the last century.
Explain what is meant by a photon.
b) The diagram shows a photocell. When the metal surface
is exposed to electromagnetic radiation, photoelectrons
are ejected. The collector collects the photoelectrons
and the sensitive ammeter indicates the presence of a
tiny current.
i. For a certain frequency and intensity of
radiation, the ammeter shows a current of
1.2 x 10-7 A. Calculate:
glass bulb
metal
radiation
1. The energy of each photon.
2. The maximum kinetic energy of each photoelectron.
3. The current in the photocell.
Vacuum
1. The charge reaching the collector in 5.0 s.
2. The number of photoelectrons reaching the collector in 5.0 s.
ii. The work function energy of the metal is 3.5 x 10-19 J and the incident radiation has
a frequency of 7.0 x 10¹4 Hz. Calculate the maximum kinetic energy of an ejected
photoelectron.
iii. The intensity of the incident radiation is doubled, but the wavelength is kept
constant. State the effect this has on each of the following:
Answer:
a) A photon is a quantum of electromagnetic radiation. It is a particle-like entity that carries energy proportional to its frequency.
b)
i.
The energy of each photon can be calculated using the equation E = hf, where h is the Planck constant. The frequency of the radiation is not given in the question, so it cannot be calculated.
The maximum kinetic energy of each photoelectron can be calculated using the equation KEmax = hf - Φ, where Φ is the work function. Since the frequency is not given in the question, this cannot be calculated.
The current in the photocell is given as 1.2 x 10^-7 A.
To calculate the charge reaching the collector in 5.0 s, we can use the equation Q = It, where Q is the charge, I is the current, and t is the time. Thus, Q = (1.2 x 10^-7 A)(5.0 s) = 6.0 x 10^-7 C.
To calculate the number of photoelectrons reaching the collector in 5.0 s, we can use the equation Q = Ne, where N is the number of electrons and e is the elementary charge. Thus, N = Q/e = (6.0 x 10^-7 C)/(1.6 x 10^-19 C/electron) = 3.75 x 10^12 electrons.
ii.
The maximum kinetic energy of an ejected photoelectron can be calculated using the same equation as in part 1, with the values given in the question: KEmax = hf - Φ = (6.626 x 10^-34 J s)(7.0 x 10^14 Hz) - 3.5 x 10^-19 J = 4.62 x 10^-19 J, or 2.88 eV.
iii.
Doubling the intensity of the incident radiation while keeping the wavelength constant will increase the number of photons incident on the metal surface, and thus increase the number of photoelectrons emitted per second. This will result in an increase in the current in the photocell. However, it will not change the energy of each photon or the maximum kinetic energy of each photoelectron, since these values depend only on the frequency of the radiation.
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3. A 16.2 kg object is at rest on an inclined plane. If the inclined plane makes an angle with the horizontal of 25.0°, what is the Normal force acting on the object?
The normal force acting on the object is equal to 145.8 N.
What is Normal Force?
Normal force is the force that a surface exerts on an object in contact with it, perpendicular to the surface. It is called the "normal" force because it is perpendicular ("normal" is a mathematical term meaning perpendicular) to the surface of contact. The normal force is equal in magnitude and opposite in direction to the component of the weight of the object that is perpendicular to the surface.
Assuming the inclined plane is frictionless, the only force acting on the object perpendicular to the plane is the normal force. The normal force (N) is equal and opposite to the force of gravity (mg) on the object, where m is the mass of the object and g is the acceleration due to gravity.
Using trigonometry, we can find the component of the force of gravity acting perpendicular to the inclined plane:
F_perpendicular = mg cos(theta)
where theta is the angle of inclination. In this case, theta = 25.0°, so we have:
F_perpendicular = (16.2 kg)(9.81 m/[tex]s^{2}[/tex]) cos(25.0°) ≈ 145.8 N
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