Strength of Materials
A semi-circular disc rests on a horizontal surface with its top flat surface horizontal and circular portion touching down. The coefficient of friction between semi-cricular disc and horizontal surface is i. 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 up towards direction of pull
unpredictable
slant down towards direction of pull
remain horizontal

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Strength of Materials
The weight of a body is due to

gravitational force of attraction towards the centre of the earth.
centripetal force of earth
force of attraction experienced by par-ticles
gravitational pull exerted by the earth

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Strength of Materials
Which one of the following statements is not correct

the tangent of the angle of friction is equal to coefficient of friction
the angle of repose is equal to angle of friction
the tangent of the angle of repose is equal to coefficient of friction
the sine of the angle of repose is equal to coefficient to friction

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Strength of Materials
Center of percussion is

the point of C.G.
point of suspension
the point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis
the point of metacentre

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