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
All of these
Increasing the number of teeth of the pinion

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Engineering Mechanics
The term 'Centroid' is

None of the listed here
The point of suspension
The same as centre of gravity
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

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Engineering Mechanics
A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

None of these
Both the balls undergo an equal change in momentum
The change in momentum suffered by rubber ball is more than the lead ball
The change in momentum suffered by rubber ball is less than the lead ball

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