Engineering Mechanics
Centre of gravity of a solid cone lies on the axis at the height

One fourth of the total height above base
One-half of the total height above base
Three eighth of the total height above the base
One third of the total height above base

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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
A machine whose efficiency is 100% is known as an ideal machine
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

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