Engineering Mechanics
The efficiency of a lifting machine is the ratio of

Output to the input
Work done by the machine to the work done on the machine
All of these
Mechanical advantage to the velocity ratio

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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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