Engineering Mechanics
The motion of a wheel of a car is

None of the listed here
Combined translation and rotational
Purely rotational
Purely translation

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Engineering Mechanics
Which of the following statement is incorrect?

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

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