Home
Class 12
PHYSICS
A uniform disc of mass 2 kg and radius ...

A uniform disc of mass 2 kg and radius 1m is mounted on an axle supported on fixed frictionless bearings. A light chord is wrapped around the rim of the disc and mass of 1kg is tied to the free end. If it is released from rest-

A

the tension in the chord is 5N

B

in first four seconds the angular displacement of the disc is 40 rad

C

the work done by the torque on the disc in first four seconds is 200J

D

the increase in the kinetic energy of the disc in the first four seconds in 200 J

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
Promotional Banner

Topper's Solved these Questions

  • 10 ROTATIONAL

    MOTION|Exercise Exercise - 3 (Level - I)|27 Videos

  • 10 ROTATIONAL

    MOTION|Exercise Exercise - 3 (Level - II)|20 Videos

  • 10 ROTATIONAL

    MOTION|Exercise Exercise - 2 (Level -I)|51 Videos

  • ALTERNATING CURRENT

    MOTION|Exercise EXERCISE - 4 (LEVEL - II)|14 Videos

Similar Questions

Explore conceptually related problems

A uniform disc of mass M and radius R is mounted on an axle supported in frictionless bearings. A light cord is wrapped around the rim of the disc and a steady downward pull T is exerted on the cord. The angular acceleration of the disc is

A uniform disc of mass M =2.50 kg and radius R = 0.20 m is mounted on an axle supported on fixed frictionless bearings. A light cord wrapped around the rim is pulled with a force 5 N. On the same system of pulley and string, instead of pulling it down, a body of weight 5 N is suspended. If the first processis termed A and the second B, the tangential acceleration of point P will be:

A uniform disc of radius R and mass M is mounted on an axis supported in fixed friction less bearing. A light cord is wrapped around the rim of the wheel and suppose we hang a body of mass m from the cord. (a) Find the angular acceleration of the disc and tangential acceleration ofpoint on the rim. (b) At a moment t= 0, the system is set in motion, find the time dependence of the angular velocity of the system and the kinetic energy ofthe whole system.

A uniform disc of mass M and radius R is mounted on a fixed horizontal axis. A block of mass m hangs from a massless string that is wrapped around the rim of the disc. The magnitude of the acceleration of the falling block (m) is

A uniform disc of radius R and mass M is free to rotate only about its axis. A string is wrapped over its rim and a body of mass m is tied to the free end of the string as shown in the figure. The body is released from rest. Then the acceleration of the body is

A disc of mass m and radius r is free to rotate about its centre as shown in the figure. A string is wrapped over its rim and a block of mass m is attached to the free end of the string. The system is released from rest. The speed of the block as it descends through a height h, is :-

Two metal discs, one with radius r and mass m and the other with radius 2r and mass 2m , are welded together and mounted on a frictionless axis through their common center. (a) What is the total moment of inertia of the two discs? (b) A light string is wrapped around the edge of the smaller disc and a block of mass m_(0) is suspended from the free end of the string. If the block is released from rest at a distance h , what is its speed just before it strikes the floor?

Figure shows a uniform disk, with mass M = 2.5 kg and radius R = 20 cm, mounted on a fixed horizontal axle. A block with mass m = 1.2 kg hangs from a massless cord that is wrapped around the rim of the disk. Find the acceleration of the falling block, the angular acceleration of the disk, and the tension in the cord. The cord does not slip, and there is no friction at the axle.

MOTION-10 ROTATIONAL-Exercise - 2 (Level - II)
  1. Four point masses are fastened to the corners of a frame of negligible...

    Text Solution

    |

  2. A particle falls freely near the surface of the earth. Consider a fixe...

    Text Solution

    |

  3. A uniform disc of mass 2 kg and radius 1m is mounted on an axle supp...

    Text Solution

    |

  4. The pulley as shown in the figure, consists of two discs of different ...

    Text Solution

    |

  5. In the figure, the massless and inextensible thread does not slip on t...

    Text Solution

    |

  6. A man spinning in free space changes the shape of his body, eg. By spr...

    Text Solution

    |

  7. A disc of mass M and radius R moves in the x-y plane as shown in the f...

    Text Solution

    |

  8. A thin uniform rod of mass m and length l is free to rotate about its ...

    Text Solution

    |

  9. In the given figure a ball strikes a uniform rod of same mass elastica...

    Text Solution

    |

  10. A ring rolls without slipping on the ground. Its centre C moves with a...

    Text Solution

    |

  11. A disc of circumference s is at rest at a point A on a horizontal surf...

    Text Solution

    |

  12. In the figure shown, the plank is being pulled to the right with a con...

    Text Solution

    |

  13. If a cylinder is rolling down the incline with sliding -

    Text Solution

    |

  14. Which of the following statements are correct

    Text Solution

    |

  15. A cylinder and a ring of same mass M and radius R are placed on the to...

    Text Solution

    |

  16. A cylinder and a ring of same mass M and radius R are placed on the to...

    Text Solution

    |

  17. A cylinder and a ring of same mass M and radius R are placed on the to...

    Text Solution

    |

  18. A ring of mass M and radius R sliding with a velocity v(0) suddenly en...

    Text Solution

    |

  19. A ring of mass M and radius R sliding with a velocity v(0) suddenly en...

    Text Solution

    |

  20. A ring of mass M and radius R sliding with a velocity v(0) suddenly en...

    Text Solution

    |