Engineering Mechanics
A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.

Not be effected
Decrease
Increase
None of these

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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 up towards direction of pull
Remain horizontal
Slant down towards direction of pull
None of these

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Engineering Mechanics
For any system of coplanar forces, the condition of equilibrium is that the

Algebraic sum of moments of all the forces about any point should be zero
All of these
Algebraic sum of the vertical components of all the forces should be zero
Algebraic sum of the horizontal components of all the forces should be zero

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