Engineering Mechanics
Whenever a force acts on a body and the body undergoes a displacement, then

Power is being transmitted
None of these
Body has kinetic energy of translation
Work is said to be done

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Engineering Mechanics
One joule means that

Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 N when it displaces a body through 1 m

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Engineering Mechanics
A semicircular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi circular disc and horizontal surface is µ. This disc is to be pulled by a horizontal force applied at one edge and it always remains horizontal. When the disc is about to start moving, its top horizontal force will

Slant down towards direction of pull
None of these
Slant up towards direction of pull
Remain horizontal

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