NEET 2017 Physics Center of Mass and Torque Multiple Correct 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 rotational motion in a body. (D) 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)
(D)
Correct Answer
Detailed Explanation
Statement (B) is correct as the center of mass is the point where the gravitational torque is zero. Statement (D) is correct as a mechanical advantage greater than one allows lifting a larger load with less effort.
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