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) Central 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)
• B. (b) and (c)
• C. (c) and (d)
• D. (b) and (d)

Answer 1

Answer: (D)

Centre of mass may or may not coincide with centre of gravity.