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Physics 101 Mechanics
November 2021
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Physics 101 Mechanics
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November 8, 2021
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November 8 of 2021
A delivery man starts at the post office, drives 40 km north, then 20 km west, then 60 km northeast, and finally 50 km north to stop for lunch. Find the displacement vector.
See image below
A distance of 100km is covered at high speed and the temperature of the air in the tyre increases. Explain in terms of pressure and volume why the tyre, which is slightly elastic, appears more rigid after the trip than before
A spring of length ???? (when unstretched) and spring constant ???? is attached to a wall and an object of mass ???? resting on a frictionless surface (see figure). The object is pulled such that the spring is stretched a distance ???? then released. Let the +????-direction be to the right.
Extrapolate even farther. According to your graphical model, what would happen if the ramp angle was increased beyond 90 degrees? Do you think the behavior of your model matches how you think the force sensor would read if the ramp was tipped beyond 90 degrees?
Why do the electric field lines not form closed loops?
Why do the electric field lines not form closed loops?
A 42-kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2 m/s. Her hands are in contact with the wall for 0.80 s. Ignore friction and wind resistance. Find the magnitude and direction of the average force she exerts on…
A 2.50 g bullet, traveling at a speed of 360 m/s, strikes the wooden block of a ballistic pendulum, such as that in the figure below. The block has a mass of 265 g.
basball was thrown up with initial speed 14m/s Find the maximum height
An object acceletates from rest to velocity 30m/s in 6s .Find the acceleration
1 mpe \( =1 / 2 \) (s) \( 2 \quad \operatorname{Re}=\frac{m p e}{m v} \) \( 3 \quad P P e=\operatorname{Re} x 100 \) EXAMPLE: \[ \frac{(5.628 \times 7-96 \times 4.4) \times 10^{2+1-4}}{(9.78 \times 8.2 \times 1.8) \times 10^{1+1-3}} \]
i have been trying to solve these equastions but i couldnt , i hope you can help me .
An unstable nucleus within an ion-beam travels with velocity v = ? c where c = 3.00 × 10^8 m.s?1 and ? < 1. As the ions travel they randomly undergo nuclear decay, emitting an ?-particle. On average they are observed to decay after traveling a distance of 6.20 m. The same ions are brought to…
As a spaceship is moving toward Earth, an Earthling measures its length to be Lm, while the captain on board radios that her spaceship’s length is 1150 m. c = 3.00 × 108ms^?1. How fast is the rocket moving relative to Earth in units of 108ms^?1?
A B+ meson has a speed of xc. It travels y mm in the laboratory before decaying. Calculate the B+ meson’s proper lifetime.
A 10kg block is pushed across a surface by the 50 N force. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?
As a spaceship is moving toward Earth, an Earthling measures its length to be 6.20Ă—10^2 m, while the captain on board radios that her spaceship's length is 1.15 x 10^3 m. How fast is the rocket moving relative to Earth in units of 10x^8 m/s. c = 3.00 x 10^8 m.
An unstable nucleus within an ion-beam travels with velocity v = ? c where c = 3.00 × 108 m.s?1 and ? < 1. As the ions travel they randomly undergo nuclear decay, emitting an ?-particle. On average they are observed to decay after traveling a distance of 6.20 m. The same ions are…
car of mass 2500 kg is traveling at 12 m/s to the right when it collides with a jeep (mass of jeep = 1560 kg) traveling in the opposite direction. In the collision the two vehicles become entangled and they both move together at 5 m/s to the left. At what speed was the jeep traveling at before…
You are standing at the intersection of two roads. You see a motorcyclist moving due North at 15 m/s. At the same time, you see your friend Ernie, in a car moving at a velocity of 23 m/s due West relative to you. The magnitude and direction of the motorcyclist’s velocity as measured by Ernie…
The highest point that a soccer ball (launched by an air cannon), can reach is 50 metres above the ground when the ball is launched from the ground at an angle of 30° above the horizontal. What is the ball’s launch speed? Assume that air friction is negligible in your calculations.
Wanting to measure the speed of sound on a hot humid day, a person mounts a loud battery powered speaker (which emits a frequency of 1300 Hz) on a scooter and then drives directly towards a stationary observer at 8 m/s. The stationary observer hears a frequency of 1350 Hz. What is speed of…
A 7 kg block is pushed across a horizontal surface by the 45 N force shown in the diagram below. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?
If the temperature of a gas in a rigid sealed container changes from 17 ? to 80? , by what factor does the sound speed in the gas change?
Two converging lenses are separated by 16.0 cm. The focal length of each lens is 10.0 cm. An object is placed 26.0 cm to the left of the lens that is on the left. Determine the magnification of the final image as seen through the two lenses.
A monatomic ideal gas has an initial temperature of 405 K. This gas expands and does the same amount of work whether the expansion is adiabatic or isothermal. When the expansion is adiabatic, the final temperature of the gas is 245 K. What is the ratio of the final to the initial volume when…
The engine in a truck accelerates the 300 kg truck from 0 m/s to 12 m/s in 10 seconds. What average power is provided by the engine in order for this to happen?
A 7 kg block is pushed across a horizontal surface by the 45 N force shown in the diagram below. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?
The highest point that a soccer ball (launched by an air cannon), can reach is 50 metres above the ground when the ball is launched from the ground at an angle of 30° above the horizontal. What is the ball’s launch speed? Assume that air friction is negligible in your calculations.
A truck, accelerating from rest with constant acceleration, travels 30m in 5 s. What is the final velocity of the truck after 5 s?
14. A dog that weighs 500 N at rest on the Earth's surface is standing on a scale on the floor of an elevator. The elevator is accelerating upward in the Earth's gravitational field at a rate of 9.8 m/s² . What does the scale read? (1) 0 N (2) 250 N (3) 500 N (4) 1000 N (5) 2000 N
A car of mass 1500 kg is traveling at 12 m/s to the right when it collides with a jeep (mass of jeep = 1000 kg) traveling in the opposite direction. In the collision the two vehicles become entangled and they both move together at 5 m/s to the left. At what speed was the jeep traveling at…
Three forces shown below act on a 5 kg particle. What is the magnitude of the acceleration of the particle?
(3) \( 8 \mathrm{~km} / \mathrm{h} \) In still water a ship can produce a maximum velocity of \( 5 \mathrm{~m} / \mathrm{s} \) in any direction. This same ship is placed in a river with a current of \( 5 \mathrm{~m} / \mathrm{s} \) eastward. With what velocity should the boat be operated with…
A small pan of mass 42.0 g is supported by two strings, as shown in Figure 12.7. The maximum tension that the string can support is 2.80 N. Mass is added gradually to the pan until one of the strings snaps. Which string is it? How much mass must be added for this to occur?
The position of a particle changes from r ? 1 = (2.0i ^ + 3.0j ^ )cm to r ? 2 = (?4.0i ^ + 3.0j ^ ) cm. What is the particle’s displacement?
Please solve and explain, thanks!
A delivery man starts at the post office, drives 40 km north, then 20 km west, then 60 km northeast, and finally 50 km north to stop for lunch. Find the displacement vector.
See image below
A distance of 100km is covered at high speed and the temperature of the air in the tyre increases. Explain in terms of pressure and volume why the tyre, which is slightly elastic, appears more rigid after the trip than before
A spring of length ???? (when unstretched) and spring constant ???? is attached to a wall and an object of mass ???? resting on a frictionless surface (see figure). The object is pulled such that the spring is stretched a distance ???? then released. Let the +????-direction be to the right.
Why do the electric field lines not form closed loops?
Why do the electric field lines not form closed loops?
A 42-kg skater is standing still in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2 m/s. Her hands are in contact with the wall for 0.80 s. Ignore friction and wind resistance. Find the magnitude and direction of the average force she exerts on…
A 2.50 g bullet, traveling at a speed of 360 m/s, strikes the wooden block of a ballistic pendulum, such as that in the figure below. The block has a mass of 265 g.
basball was thrown up with initial speed 14m/s Find the maximum height
An object acceletates from rest to velocity 30m/s in 6s .Find the acceleration
1 mpe \( =1 / 2 \) (s) \( 2 \quad \operatorname{Re}=\frac{m p e}{m v} \) \( 3 \quad P P e=\operatorname{Re} x 100 \) EXAMPLE: \[ \frac{(5.628 \times 7-96 \times 4.4) \times 10^{2+1-4}}{(9.78 \times 8.2 \times 1.8) \times 10^{1+1-3}} \]
As a spaceship is moving toward Earth, an Earthling measures its length to be Lm, while the captain on board radios that her spaceship’s length is 1150 m. c = 3.00 × 108ms^?1. How fast is the rocket moving relative to Earth in units of 108ms^?1?
A B+ meson has a speed of xc. It travels y mm in the laboratory before decaying. Calculate the B+ meson’s proper lifetime.
A 10kg block is pushed across a surface by the 50 N force. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?
As a spaceship is moving toward Earth, an Earthling measures its length to be 6.20Ă—10^2 m, while the captain on board radios that her spaceship's length is 1.15 x 10^3 m. How fast is the rocket moving relative to Earth in units of 10x^8 m/s. c = 3.00 x 10^8 m.
An unstable nucleus within an ion-beam travels with velocity v = ? c where c = 3.00 × 108 m.s?1 and ? < 1. As the ions travel they randomly undergo nuclear decay, emitting an ?-particle. On average they are observed to decay after traveling a distance of 6.20 m. The same ions are…
car of mass 2500 kg is traveling at 12 m/s to the right when it collides with a jeep (mass of jeep = 1560 kg) traveling in the opposite direction. In the collision the two vehicles become entangled and they both move together at 5 m/s to the left. At what speed was the jeep traveling at before…
You are standing at the intersection of two roads. You see a motorcyclist moving due North at 15 m/s. At the same time, you see your friend Ernie, in a car moving at a velocity of 23 m/s due West relative to you. The magnitude and direction of the motorcyclist’s velocity as measured by Ernie…
The highest point that a soccer ball (launched by an air cannon), can reach is 50 metres above the ground when the ball is launched from the ground at an angle of 30° above the horizontal. What is the ball’s launch speed? Assume that air friction is negligible in your calculations.
Wanting to measure the speed of sound on a hot humid day, a person mounts a loud battery powered speaker (which emits a frequency of 1300 Hz) on a scooter and then drives directly towards a stationary observer at 8 m/s. The stationary observer hears a frequency of 1350 Hz. What is speed of…
A 7 kg block is pushed across a horizontal surface by the 45 N force shown in the diagram below. The block moves at a constant velocity of 2 m/s. How big is the coefficient of kinetic friction between the block and the surface?
If the temperature of a gas in a rigid sealed container changes from 17 ? to 80? , by what factor does the sound speed in the gas change?
Two converging lenses are separated by 16.0 cm. The focal length of each lens is 10.0 cm. An object is placed 26.0 cm to the left of the lens that is on the left. Determine the magnification of the final image as seen through the two lenses.
The engine in a truck accelerates the 300 kg truck from 0 m/s to 12 m/s in 10 seconds. What average power is provided by the engine in order for this to happen?
The highest point that a soccer ball (launched by an air cannon), can reach is 50 metres above the ground when the ball is launched from the ground at an angle of 30° above the horizontal. What is the ball’s launch speed? Assume that air friction is negligible in your calculations.
A truck, accelerating from rest with constant acceleration, travels 30m in 5 s. What is the final velocity of the truck after 5 s?
14. A dog that weighs 500 N at rest on the Earth's surface is standing on a scale on the floor of an elevator. The elevator is accelerating upward in the Earth's gravitational field at a rate of 9.8 m/s² . What does the scale read? (1) 0 N (2) 250 N (3) 500 N (4) 1000 N (5) 2000 N
A car of mass 1500 kg is traveling at 12 m/s to the right when it collides with a jeep (mass of jeep = 1000 kg) traveling in the opposite direction. In the collision the two vehicles become entangled and they both move together at 5 m/s to the left. At what speed was the jeep traveling at…
A small pan of mass 42.0 g is supported by two strings, as shown in Figure 12.7. The maximum tension that the string can support is 2.80 N. Mass is added gradually to the pan until one of the strings snaps. Which string is it? How much mass must be added for this to occur?
The position of a particle changes from r ? 1 = (2.0i ^ + 3.0j ^ )cm to r ? 2 = (?4.0i ^ + 3.0j ^ ) cm. What is the particle’s displacement?
Please solve and explain, thanks!