Rotational Motion (JEE (Based on NTA Guidelines-IIT Engg.) Advanced Physics): Questions 1 - 2 of 13

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Question number: 1

» Rotational Motion » Conservation of Angular Momentum

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Appeared in Year: 2014

MCQ▾

Question

A horizontal circular platform of radius and mass is free to rotate about its axis. Two massless spring toy – guns, each carrying a steel ball of mass are attached to the platform at a distance from the centre on its either sides along its diameter (see figure). Each gun simultaneously fires the balls horizontally and perpendicular to the diameter in opposite directions. After leaving the platform, the balls have horizontal speed of with respect to the ground. The rotational speed of the platform in after balls leave the platform is:

A horizontal circular platform

A Horizontal Circular Platform

In figure, a horizontal circular platform is shown.

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 2

» Rotational Motion » Conservation of Angular Momentum

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Appeared in Year: 2016

MCQ▾

Question

A block with mass is connected by a massless spring with stiffness constant to a rigid wall and moves without friction on a horizontal surface. The block oscillates with small amplitude about an equilibrium position . Consider two cases: (i) when the block is at ; and (ii) when the block is at . In both the cases, a particle with mass is softly placed on the mass ?

Choices

Choice (4) Response

a.

The amplitude of oscillation in the first case changes by a factor of , whereas in the second case it remains unchanged.

b.

The instantaneous speed at of the combined masses decreases in both the cases.

c.

The final time – period of oscillation in both the cases is same.

d.

All c. , a. and b. are correct

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