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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Understanding +4 | -1

Assertion: The centre of mass of system of

n

particles is the weighted average of the position vector of the

n

particles making up the system.
Reason: The position of the centre of mass of a system is independent of coordinate system.

View answer and explanation

Correct option: B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

The correct answer is B (If both assertion and reason are true but reason is not the correct explanation of the assertion) because while both statements are true, the coordinate system independence doesn't explain the weighted average nature of the center of mass.

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x

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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

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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)