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Chapter 40: Practice Exercises

- A pendulum consisting of a mass m attached to a light string of length is displaced from its rest position, making an angle th with the vertical.

- The conveyor belt machine has an engine.

- A mass m is moving along the floor.
- The mass encounters a part of the floor that has a coefficient of friction.

- Two mass are dropped at the same time.

- The maximum vertical displacement of the pendulum is 17 cm above its rest position.

- The spring has been compressed by 0.04 m and a mass rests on top of it.

- A box is pulled along a smooth floor by a force F.

- A sphere is dropped through a column of liquid.
- The sphere has a speed of 5 m/s when it has fallen a distance of 2.0 m.

- A mass is attached to a massless spring by a light string that passes over a pulley.
- When the mass is released, the spring has a force constant of 500 N/m.

- A block is on an incline.
- The mass is connected to a massless spring by means of a light string.
- The force constant is 100 N/m.
- The spring is un stretched after the block is released.
- The block comes to rest at a distance of 16 cm.

- A car is travelling up a steep incline at a speed of 25 MPH.

- If you divide 1 N by 2, you get 1 kg m/s 2.

- You can verify which expression has units of joules per second to get the answer.

- gravity is the only conservative force that can do work if there is no friction.

- The average force must be halved if the velocity is doubled and the power is constant.
- The average speed of the belt must be halved.

- The work is being taken from the beginning.
- Since the motion is horizontal, N is equal to f.

- The velocity changes will be the same regardless of the amount of mass.

- The work needed to raise the mass a height is provided by this energy.

- h is equal to 0.54 m.

- The value decreases with angle.
- The work decreases as well.

- As long as the same mass is raised to the same height, the work done to run up the stairs remains the same.

- If we assume that the starting energy for the system is zero, the loss of potential energy is balanced by a gain in elastic potential energy for the spring.
- The mass displacement is the same as the spring's.

- v is 1.7 m/s.

- The work done by gravity down the incline is affected by the work done by friction.
- The net work is applied to stretching the spring by an amount equal to the displacement of the mass.

- The coefficient of friction is given a value of 0.036.

- The motion of an object is relative to the frame of reference.
- We can imagine a second frame moving with the object in which it appears to be at rest, if an object is moving relative to one frame.
- The object has energy because of its relative motion.
- In the second frame, the object appears to be at rest.

- The force of gravity causes your arm muscles to strain.
- You feel tired because this requires energy from your body.

- We use our knowledge of inclined planes to determine how much force the car must exert in order to cancel out the downward force of gravity.

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