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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Analyzing +4 | -1

Assertion: If ice caps of the pole melts, the day length will shorten.
Reason: Ice flows towards the equator and decreases the moment of inertia of the earth and hence increases the frequency of rotation of the earth.

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Correct option: A

If both assertion and reason are true and reason is the correct explanation of the assertion

Option D is correct because the charge will oscillate about the origin, but the restoring force is not proportional to the displacement, so it's not SHM.

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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}

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

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\mathrm{CM}

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

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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

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)