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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Assefion: Radius of gyration of body is a constant quantity.

Reason: The radius of gyration of a body about an axis of rotation may be defined as the root mean square distance of the particle from the axis of rotation.

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Correct option: D

If both the Assertion and Reason are incorrect.

Option D (If both the Assertion and Reason are incorrect) is correct because the radius of gyration is not a constant quantity and depends on the axis of rotation and mass distribution.

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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}

has linear mass density

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

x

is measured from

\mathrm{A}

\mathrm{CM}

of the rod lies at a distance of

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

\mathrm{A}

\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)