How to solve physics question?

Posted on 2014-12-12 06:19:00 in Physics by CHRYSTAL

Question 1

During a certain time interval, a constant force delivers an average power of 4 watts to an object.

If the object has an average speed of 2 meters per second and the force acts in the direction of motion of the object, what is the magnitude of the force F? ?





Question 2

A ball is thrown upward. At a height of 10 meters above the ground, the ball has a po- tential energy of 50 Joules (with the potential energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 Joules.

What is the maximum height h reached by the ball? Consider air friction to be negligible.





Question 3

A frictionless pendulum of length 3 m swings with an amplitude of 10?. At its maximum displacement, the potential energy of the pen- dulum is 10 J.

What is the kinetic energy of the pendulum when its potential energy is 5 J?

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