Laws of Motion

• Question 501

## Out of the following pair, which one does NOT have identical dimensions is angular momentum and Planck’s constant impulse and momentum moment of inertia and moment of a force work and torque

Solution

C.

moment of inertia and moment of a force

Question 502

## A body A of mass M while falling vertically downwards under gravity breaks into two parts; a body B of mass 1/3 M and a body C of mass 2/3 M. The centre of mass of bodies B and C taken together shifts compared to that of body A towards depends on height of breaking does not shift body C body B

Solution

B.

does not shift

No horizontal external force is acting
∴ = acm =0
since vcm= 0
∴∆xcm = 0

Question 503

## A particle of mass 0.3 kg is subjected to a force F=−kx with k=15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin? 3 m/s2 15 m/s2 5 m/s2 10 m/s2

Solution

D.

10 m/s2

a = kx/m =10m /s2

Question 504

Solution

A.

## Entrance Exams Preparation

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