MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Area and Volume Expansion

The radius of...

Question

The radius of a rotating sphere decreases by $2 %$ keeping the mass constant, the change in its rotational kinetic energy?

A

2 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

1 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

4 %

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

D

8 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is D $4 %$

Suggest Corrections

thumbs-up

0

Similar questions

Q. Let g be acceleration due to gravity at earth's surface and K the rotational kinetic energy of the earth. Suppose the earth's radius decreases by 2%. Keeping all other quantities constant, then:

Q. A solid cylinder of mass,

m

r

, is rotating at an angular velocity,

ω

when a non-rotating cylinder of double the mass and equal radius drops onto the cylinder.
By what factor does this change the rotational kinetic energy with regard to its initial rotational kinetic energy

K_{r o t}

?

Q. Circular disc of mass

2 k g

1 m

is rotating about an axis perpendicular to its plane and passing through its centre of mass with a rotational kinetic energy of

8 J

The angular momentum in (

J s

Q. A solid sphere of radius

^{'} r^{'}

^{'} m^{'}

is rotating about an axis passing through its COM with an angular speed

^{'} ω^{'}

and has rotational kinetic energy

k_{1}

. If the radius of the sphere is halved and angular speed is doubled, then its rotational kinetic energy becomes

k_{2}

. Which of the following options is correct ?

Q. A solid sphere of mass

m

R

is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation

(E_{sphere} / E_{cylinder})

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Thermal Expansion

PHYSICS

Watch in App

explore_more_icon

Explore more

Area and Volume Expansion

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon