OnlineCBT
Physics · SYSTEMS OF PARTICLES AND ROTATIONAL MOTION
हिन्दीConsider the following statements regarding levers and the centre of gravity: (A) The Mechanical Advantage (M.A.) of a lever is defined as the ratio of load to effort (\( F_1/F_2 \)). (B) The Mechanical Advantage of an ideal lever is mathematically given by \( d_1/d_2 \), where \( d_1 \) is the load arm and \( d_2 \) is the effort arm. (C) The moment of a couple acting on a rigid body varies with the choice of the reference point about which moments are computed. (D) In a uniform gravitational field, the centre of gravity of a body coincides precisely with its centre of mass. Choose the correct answer from the options given below:
Correct answer · Option 1
(A) and (D) only
Explanation
(A) and (D) are correct. (B) is incorrect because \( \text{M.A.} = d_2/d_1 \). (C) is incorrect because the moment of a couple is independent of the reference origin.
