22.
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

24.
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

25.
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

30.
Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is
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