Engineering Mechanics
The velocity ratio of a single purchase crab winch can be increased by

Increasing the length of the handle
Increasing the radius of the load drum
Increasing the number of teeth of the pinion
All of these

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Engineering Mechanics
The static friction

Always acts in a direction, opposite to that in which the body tends to move
Bears a constant ratio to the normal reaction between the two surfaces
All of these
Is independent of the area of contact, between the two surfaces

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