Engineering Mechanics
A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

P = W (sinα + μcosα)
P = W tan (α + φ)
P = W (cosα + μsinα)
P = W tanα

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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:

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

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Engineering Mechanics
Which of the following statement is incorrect?

The velocity ratio of a machine is the ratio of load lifted to the effort applied
The ratio of the limiting friction to the normal reaction is called coefficient of friction
A force acting in the opposite direction to the motion of the body is called force of friction
A machine whose efficiency is 100% is known as an ideal machine

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