The diagram shows a single fixed pulley used by a boy to lift a
load of 400 N through a vertical height of 5 m in 10 seconds.
The effort applied by the boy on the other end of the rope is
480 N.
a) What is the velocity ratio of a pulley?
b) What is its MA?
c) Calculate its efficiency.
d) Why is the efficiency of the pulley not 100 %?
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