Question

3. A student places a physics book on their outstretched palm. They then raise the book vertically upward at a constant speed. While the student is raising the book at constant speed, does the total energy of the book Earth system (kinetic plus potential) increase, decrease, or stay the same? Explain 4. An Awood machine consists of a light string draped over a low friction pulley, with a lighter mass (mi) attached to one end of the string and a heavier mass (m2) attached to the other end. A hand holds me in place as shown, with the lighter mass just touching the floor and the string taut. The hand then releases m2. The masses increase in speed as m2 moves downward and mi moves upward. Discuss what's going on with energy in this scenario, from just after the hand lets go to just before the heavier weight crashes into the floor. Answer on the back of this page. Your explanation should be at least one paragraph long hand

Answer 1

Page No. Date gook Book is moving with some speed So, acceleretson is zero and work " on Now, hook external Hence it agent is energy doing some will increase The net force on the system is a conservative (gravitational force) . Hence it meehanical energy will remains conserved. As heavier block mores downward and light er upward I Both have some magnitude of displacement So, net potential energy decreases but net Kinetic energy increases kinete energy + Potential energy - Constant Sweet Selfie