Strength of Materials
Which of the following do not have identical dimensions?

Torque and work
Moment of a force and angular momentum
Momentum and impulse
Torque and energy

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Strength of Materials
Coefficient of friction is the

the friction force acting when the body is just about to move
ratio of limiting friction and normal reaction
the friction force acting when the body is in motion
angle between normal reaction and the resultant of normal reaction and the limiting friction

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Strength of Materials
The weight of a body is due to

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

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