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

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

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane

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