Engineering Mechanics - Study Mode

[#256] 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 ยต. 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
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(C) Slant down towards direction of pull

[#257] When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
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(A) Inward

[#258] Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then
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(D) The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

[#259] According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then
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(C) The algebraic sum of their moments about any point in their plane is zero

[#260] The necessary condition for forces to be in equilibrium is that these should be
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(C) Both (A) and (B) above