JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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There are some passengers inside a stationary railway compartment. The centre of mass of the compartment itself (without the passengers) is

C_1,

while the centre of mass of the 'compartment plus passengers' system is

C_2.

If the passengers move about inside the compartment then

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Correct option: C

C_1

Will move but

C_2

will be stationary with respect to the ground

Option C is correct because the center of mass of the compartment plus passengers system remains stationary as there is no external force, while the compartment itself moves to compensate for the passengers' movement.

More Questions from SYSTEM OF PARTICLES

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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}

of length

\mathrm{L}

has linear mass density

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

, where

x

is measured from

\mathrm{A}

. If the

\mathrm{CM}

of the rod lies at a distance of

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

from

\mathrm{A}

, then a and

\mathrm{b}

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)