Question

Which of the following statements are correct?

1. Centre of mass of a body always coincides with the centre of gravity of the body.
2. Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
3. A couple on a body produce both translational and rotational motion in a body.
4. Mechanical advantage greater than one means that small effort can be used to lift a large load.

• (b) and (d)
• (a) and (b)
• (b) and (c)
• (c) and (d)

Answer 1

The Correct Option is A

The correct option is (A): (b) and (d).