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

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

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Same at every point on its line of action
Minimum, if it acts at the center of gravity of the body
Maximum, if it acts at the center of gravity of the body
Different at different points on its line of action

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