Rotational Motion (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 6 - 8 of 13

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Question number: 6

» Rotational Motion » Torque

Appeared in Year: 2013

MCQ▾

Question

A wheel of radius R with an axle of radius R2 is shown in the figure and is free to rotate about a frictionless axis through its centre and perpendicular to the page. Three forces (F, F, 2F) are exerted tangentially to the respective rims as shown in the figure,

A wheel of radius R with an axle of radius R/2

A Wheel of Radius R With an Axle of Radius R/2

In figure a wheel of radius R with an axle of radius R/2 is shown. Three forces: F, F and 2F are exerted tangentially to the respective rims

The magnitude of the net torque acting on the system is nearly

Choices

Choice (4) Response

a.

1.5 FR

b.

3.5FR

c.

2.5 FR

d.

3.2 FR

Question number: 7

» Rotational Motion » Moment of Inertia

Appeared in Year: 2015

MCQ▾

Question

The moments of inertia of a non – uniform circular disc (of mass M and radius R) about four mutually perpendicular tangents AB, BC, CD, DA are I1, I2, I3 and I4, respectively (the square ABCD circumscribes the circle). The distance of the centre of mass of the disc from its geometrical centre is given by,

Choices

Choice (4) Response

a.

13MR(I1I2)2+(I3I4)2

b.

12MR(I1+I3)2+(I2+I4)2

c.

112MR(I1I3)2+(I2I4)2

d.

14MR(I1I3)2+(I2I4)2

Question number: 8

» Rotational Motion » Moment of Inertia

MCQ▾

Question

A homogeneous sphere of mass M and radius R has moment of inertia I about its diameter. A concentric sphere of radius R3 is carved out from the sphere. What is the moment of inertia of the remaining part about the diameter?

Choices

Choice (4) Response

a.

910I

b.

242243I

c.

94I

d.

8180I

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