2) A 200-kg boulder is 1000 m above the ground. a)What is its potential energy when it is 1000 m above the ground b) What is its kinetic energy when it is 1000-m above the ground? The boulder begins to fall. What is its potential energy when it is 500- the ground? c)Where did the "lost" potential energy go? d) What is the kinetic energy of the boulder when it has fallen 500 m? e) What is the kinetic energy of the boulder just before it hits the ground

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.