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प्रश्न
Which of the following statements are correct?
विकल्प
Centre of mass of a body always coincides with the centre of gravity of the body.
Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
A couple on a body produce both translational and rotational motion in a body.
Mechanical advantage greater than one means that small effort can be used to lift a large load.
MCQ
उत्तर
Centre of mass of a body always coincides with the centre of gravity of the body.
Explanation:
a. A body's centre of mass and centre of gravity may not always be the same.
c. A coupling on a body creates motion that is only rotational.
Only (b) and (d) are therefore accurate.
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