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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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The centre of mass of a body is defined as the point at which the whole of its mass is supposed to be concentrated, while centre of gravity of a body is defined as the point at which whole of its weight is supposed to be concentrated then,

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Correct option: B

the centre of gravity may lie slightly below the centre of mass

Option B (the centre of gravity may lie slightly below the centre of mass) is correct because the gravitational field is not perfectly uniform, and the lower parts of an object experience slightly stronger gravity.

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It is easier for a swimmer jumping into water from a height to describe a loop in the air by A uniform thin rod

\mathrm{AB}

\mathrm{L}

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\mu(x)=a+\frac{b x}{L}

x

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\mathrm{A}

\mathrm{CM}

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\left(\frac{7}{12}\right) \mathrm{L}

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\mathrm{b}

are related as : A solid metal ring and a disc of same radius and mass are rotating about their diameters with same angular frequency. The ratio of their respective rotational kinetic energy values is When a torque acting upon a system is zero, then which of the following will be constant A point particle of mass

1.0 \mathrm{~g}

is rotating in a circle of diameter

8 \mathrm{~cm}

. Its moment of inertia will be The angular velocity of a particle is given by

\omega = {t^4} + 2{t^3}

then its angular acceleration of the particle at

t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)