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Question

Which of the following statements are correct?
a) Centre of mass of a body always coincides with the centre of gravity of the body.
b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
c) A couple on a body produce both translational and rotation motion in a body.
d) Mechanical advantage greater than one means that small effort can be used to lift a large load.

A
(a) and (b)
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B
(b) and (c)
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C
(c) and (d)
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D
(b) and (d)
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Solution

The correct option is D (b) and (d)
Centre of mass may lie on centre of gravity but net torque of gravitational pull is zero about centre of mass.

Mechanical advantage = LoadEffort > 1
Load > Effort

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