Question

A baseball player standing 20.0m away from a flat-roof garage throws a ball with the speed 16.0m/s at 40◦ above the horizontal. The ball leaves player’s hand 2.0m above the ground and lands on the roof a 4.0m above the ground.
How far above the ground does the ball reach?

How long is the ball in flight before landing on the roof?

How far past the edge of the roof, show as x in the picture, does the ball land?

What is the speed and direction (angle from the horizontal) of the ball’s landing velocity?

A 250kg satellite orbits the Earth once every two hours a 2.30×106 m above the surface of the Earth. The radius of the Earth is 6.37×106 m.

(a) What is the angular speed of the Satellite?

What is centripetal acceleration of this satellite?

What is the gravitational force of the Earth on this satellite? Hint: your answer in part (b) is useful

A mover pushes a 50.0kg container box across a level floor with a 200N force directed 30◦ below the horizontal line. The coefficient of friction between the box and the floor is 0.200.

(a) Draw the free body diagram of all force acting on the box in the reference frame shown in the picture.

) Find the normal force on the box and the force of friction between the box and the floor. (5 points)

Find the acceleration of the box.

The force-time graph shown on the right represents the impulse delivered to a 4.0kg object. The object is seen moving to the left at 5.0m/s at t = 0. Take horizontal to the right to be the positive direction.
(a) Find the impulse delivered to this object.

Find the final velocity of the object.

c) Calculate the average force delivered to this object between t = 2.0s and t = 8.0s.

Answer 1

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