EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Rotational Mechanics>KEAM 2020>Q 5

MEDIUM

KEAM

IMPORTANT

Earn 100

A solid sphere of radius $r$ is revolving about one of its diameters with an angular velocity $ω .$ If it suddenly expands uniformly so that its radius increases to $n$ times its original value, then its angular velocity becomes

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Important Questions on Rotational Mechanics

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Rotational Mechanics>KEAM 2018>Q 6

A thin circular ring of mass

m

and radius

R

is rotating about its axis perpendicular to the plane of the ring with a constant angular velocity

ω

. Two point particles each of mass

M

are attached gently to the opposite ends of a diameter of the ring. The ring now rotates, with an angular velocity

\frac{ω}{2}

. Then, the ratio

\frac{m}{M}

is

HARD

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Rotational Mechanics>KEAM 2020>Q 7

If a ring rolls down from top to bottom of an inclined plane, it takes time

t_{1} .

If it slides, it takes time

t_{2} .

Then the ratio

\frac{t_{2}^{2}}{t_{1}^{2}}

is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Rotational Mechanics>KEAM 2019>Q 8

A ball of mass

1 kg

and radius

0.5 m,

starting from test rolls down on a

30 °

inclined plane. The torque acting on the ball at the distance of the

7 m

from the starting point is close to (take acceleration due to gravity as

10 m / s^{2})

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 10 - Rotational Mechanics>KEAM 2019>Q 9

If the radius of the earth suddenly decreases by half of its present value. Then the time duration of one day will be