Input force?

Question

How can I calculate the amount of input force I would need with each turn of the handle and the total amount of force to raise the books with the distance of 20 cm.
the handle has a circumference of 150 cm., the pitch is 2 cm. and the books weigh 10 kg.
would it be F=2pir or W*P/2pir
If i used a pulley system using the same books which one of these machines will have greatest mechanical advantage.

Answer 1

The applied force moves through the circle while weight moves through the pitch distnace.

F x 2 pi r = W p

F = w *p / (2pi r)

Answer 2

While I forgot my physics formulae long ago, force is not the same as work. Forget about circumference, pitch and mechanical advantage. You just need to find the energy to move 10kg 20cm against one g. In fact, you don't need to solve for force but energy, or work.

Answer 3

well bud, you should KNOW before hand what the output force you are going to need is (the load you want to carry in Kg X10) as everything things else (input force and pulley system used) depends on that.