Do I have to say PLEASE for an answer!?

Question

You are shelving books in a library. You lift a book from the floor to the top shelf. The KE of the book on the floor was 0, & the KE of the book on the top shelf is 0, so there is no change in KE. Yet you did some work in lifting the book. Is the work-Kinetic energy theorem violated?

& LAST question (some assistance please)

- A ball is throw straight up into the air. At what position is the KE a maximum? At what position is the gravitiational potential energy a maximum?

Answer 1

1) No. Whatever happens to the book, it won't violate any compeltely established and proven energy theorem. Trust me.

2) Look at the formulas for these 2 items: GPE = mgh, so if m& g are fixed, GPEmax HAS to be when h is max. Do the same 'thought experiment' for KE...............

sarah, look over your 2nd paragraph. I think you got it backwards. Not too late to edit!

Answer 2

For the first question, no because the book is put back onto a shelf. It has potential energy because there's no movement. It would have maximum KE if you let go of the book into the air where the shelve is. Since you're replacing the book on a shelf, it can't have any KE.

KE is maximum at the point where the ball is suspended in air because it has no potential energy. The PE is at a maximum when the ball has hit the floor.

Answer 3

your question is too tough that's y no one is answering it!
Please never hurt anybody!