The figure below shows an arrangement of pulleys designed
the lifting of a heavy load L. Assume that friction can be ignored
everywhere and that the pulleys
to which the load is
attached weigh a total of 20.0 lb. An 840-lb load is to be raised 12.0
(a) What is the minimum applied force F that can lift
(b) How much work must be done against gravity in
lifting the 840-lb load 12.0 ft?
(c) Through what distance
must the applied force be exerted to lift the load 12.0 ft?
How much work must be done by the applied force F to accomplish this