Question

This is another problem that I need clarification on since no one seems to be of any help at my school,

A pulley system is used to lift a 52- crate.Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume the masses of the chains, pulleys, and ropes are negligible.

Determine the force required to lift the crate with constant speed.

Determine the tension in the upper chain, and lower chain.

Answer 1

The answer depends on how the pulleys are wrapped.

http://www.tech.farmingdale.edu/~betzja/crane/pulley.html

Answer 2

C ( )
| O |
| | |
| | |
| | |
O ) (Force via hand)
|
[52kg]

Sorry for such a crude drawing but if you imagine the lines as the rope, the parentheses as curves in the line, and O's as the pulleys. C = Cieling