21. The maximum acceleration of a particle moving with simple harmonic motion is
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
23. When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
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
26. The necessary condition for forces to be in equilibrium is that these should be
27. The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.
28. The motion of a particle round a fixed axis is
29. If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
30. Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is
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