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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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A binary star consists of two stars A (mass 2.2

{M_s}

) and B (mass 11

{M_s}

), where

{M_s}

is the mass of the sun. They are separated by distance d and are rotating about their centre of mass, which is stationary. The ratio of the total angular momentum of the binary star to the angular momentum of star B about the centre of mass is

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Correct option: B

6

Option B (6) is correct because the ratio of total angular momentum to the angular momentum of star B is calculated using the moment of inertia and angular velocity relationship, considering the inverse proportionality between radius and mass.

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\mathrm{AB}

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\mathrm{CM}

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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

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is rotating in a circle of diameter

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. 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)