# Rotational Motion [JEE (Based on NTA Guidelines-IIT Engg.) Advanced Physics]: Questions 3 - 4 of 13

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## Question number: 3

» Rotational Motion » Angular Momentum

Appeared in Year: 2016

### Question

Two thin circular discs of mass and , having radii of and , respectively, are rigidly fixed by a massless, rigid rod of length through their centers. This assembly is laid on a firm and flat surface, and set rolling without slipping on the surface so that the angular speed about the axis of the rod is . The angular momentum of the entire assembly about the point is (see the figure). Which of the following statement (s) is (are) true?

### Choices

Choice (4) | Response | |
---|---|---|

a. | The magnitude of angular momentum of the assembly about its centre of mass is . | |

b. | The center of mass of the assembly rotates about the axis with an angular speed of . | |

c. | The magnitude of angular momentum of center of mass of the assembly about the point is . | |

d. | Both b. and a. are correct |

## Question number: 4

» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion

Appeared in Year: 2014

### Question

A uniform circular disc of mass and radius is initially at rest on a horizontal frictionless surface. Three forces of equal magnitude are applied simultaneously along the three sides of an equilateral triangle with its vertices on the perimeter of the disc (see figure). One second after applying the forces, the angular speed of the disc in is:

### Choices

Choice (4) | Response | |
---|---|---|

a. | 8 | |

b. | 6 | |

c. | 2 | |

d. | 4 |