Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Work done by the machine to the work done on the machine
All of these
Mechanical advantage to the velocity ratio
Output to the input

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Engineering Mechanics
One joule means that

Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 N when it displaces a body through 1 m

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