Ap Physics Unit 4 part 1 quest

Calculate the final speed of a 2.00-kg object that is pushed from rest for 22.0 m by a 40.0-N force directed 20.0^o below the horizontal, on a smooth, level floor.

• 15.8 m/s

• 18.8 m/s

• 28.8 m/s

• 32.8 m/s

A small truck has a mass of 2400 kg. What is the work required to decrease the speed of the vehicle from 22.0 to 12.0 m/s on a level road?

• 4.08 x 10⁵ J

• − 4.08 x 10⁵ J

• 9.19 J

• − 9.19 J

A 1250.0 kg box that was initially at rest falls off a platform and at a certain height is falling at a speed of 25.0 m/s . How far has it fallen from the platform? (neglect air friction)

• 8.79 m

• 12.3 m

• 31.9 m

• 46.5 m

Earth orbits the Sub at a radius of about 1.5 x 10⁸ km. At this distance the force of gravity on Earth due to the Sun is 3.6 x 10²² N. Assuming the Earth's orbit to be perfectly circular, how much work does the Sun's gravity do on Earth in one year?

• 5.4 x 10³⁰ J

• 1.1 x 10³¹ J

• No work is done by the suns gravity

• Not enough information

A 40.0 kg boy steps on a skateboard and pushes off from the top of a hill. What is the change in the potential energy of the Earth-boy system as the boy glides down to the bottom of the hill, 4.35 m below the starting level?

• 1.53 x 10³ J

• 1.71 x 10³ J

• 2.75 x 10³ J

• 3.51 x 10³ J

How much additional potential energy is stored in a spring that has a spring constant of 15.5 N/m if the spring is stretched so that the displacement of the end of the spring moves from 10.0 cm to 15.0 cm, measured from its relaxed equilibrium position?

• 9.69 x 10⁻² J

• 1.26 x 10⁻¹ J

• 1.46 x 10⁻¹ J

• 1.82 x 10⁻² J

A 0.145 kg baseball rebounds off of a wall. The rebound speed is one-third of the original speed. By what percent does the kinetic energy change in the collision with the wall?

• 25%

• 34%

• 44%

• 89%

An car traveling on a straight, level road has an initial speed v when the brakes are applied. In coming to rest with a constant acceleration, it travels a distance x. How far would the car travel in coming to rest if it had the same acceleration but an initial speed of 2v?

• 1/2 x

• 1/4 x

• 2x

• 4x

A rubber ball with mass 0.20 kg is dropped vertically from a height of 1.5 m above the floor. The ball bounces off the floor, and during the bounce 0.60 J of energy is dissipated. What is the maximum height of the ball after the bounce?

• 0.30 m

• 0.90 m

• 1.2 m

• 1.5 m

A block of mass m initially at rest is pulled up along the incline. At a height h it has kinetic energy K_f. The coefficient of friction with the incline is μ. Which of the following correctly represent the net work done on the block

• K_f

• K_f + mgh

• K_f − mgh

• K_f − μmgh