Engineering Mechanics
The mechanical advantage of a lifting machine is the ratio of

Output to the input
Distance moved by effort to the distance moved by load
All of these
Load lifted to the effort applied

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

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

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