Home
Class 11
PHYSICS
Assertion: A carpet is wrapped like a cy...

Assertion: A carpet is wrapped like a cylinder and is pushed on a horizontal surface to unwrap. As the carpet unwraps its angular speed is found to increase.
Reason: Angular momentum of rolling part remains conserved

A

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

B

If both assertion and reason are correct but reason is not the correct explanation of assertion

C

If assertion is correct but reason is incorrect.

D

If assertion is incorrect but reason is correct

Text Solution

Verified by Experts

The correct Answer is:
C
Angular momentum of rolling part is not constant due to torque of tension applied from stationary part on the surface. When carpet is unfolded then centre of mass of system goes down and decrease in gravitational potential energy of the system results in the form of increased kinetic energy of rolling part.
Promotional Banner

Topper's Solved these Questions

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    MODERN PUBLICATION|Exercise COMPETITION FILE ( OBJECTIVE TYPE QUESTIONS (MATCHING TYPE QUESTIONS) )|3 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS (MATRIX MATCH TYPE QUESTIONS) )|1 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    MODERN PUBLICATION|Exercise COMPETITION FILE ( OBJECTIVE TYPE QUESTIONS MULTIPLE CHOICE QUESTIONS (with more than one correct answer) )|35 Videos

  • PHYSICAL WORLD

    MODERN PUBLICATION|Exercise Revision exercises (Long answer questions)|6 Videos

  • THERMAL PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|15 Videos

Similar Questions

Explore conceptually related problems

Assertion : There are two propellers in a helicopter. Reason : Angular momentum is conserved.

Assertion: A boy is rotating in a rotating chair with some angular speed. Initially arma of the boy are stretched out. When boy folds his hands then angular speed increases Reason: Angular momentum of the system is conserved in absence of external torque.

A symmetrical body of mass M and radius R is rolling without slipping on a horizontal surface with linear speed v. Then its angular speed is

A cylinder of mass 5kg and radius 10cm is moving on a horizontal surface with speed. 5m//s and angular speed about axis through C.M. 10rad//s . Find the angular momentum of the cylinder about point of contact.

A disc is undergoing rolling on a horizontal surface. Which of the statement about angular momentum of the disc is incorrect ?

Assertion : Angular speed of a planet around the sun increases, when it is closer to the sun. Reason : Total angular momentum of the system remains constant.

A thin ring of mass m and radius R is in pure rolling over a horizontal surface. If v_0 is the velocity of the centre of mass of the ring, then the angular momentum of the ring about the point of contact is

An solid cylinder of mass 20 kg and radius 20 cm rotates about its axis with a angular speed 100 rad s^-1 . The angular momentum of the cylinder about its axis is.

Assertion: A satellite is orbiting around a planet then its angular momentum is conserved Reason: Linear momentum conservation leads to angular momentum conservation.

A solid cylinder is rolling without slipping down an inclined plane. Then its angular momentum is :