Rotational Motion-Concepts of Rotational Motion (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 2 of 2

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Question number: 1

» Rotational Motion » Concepts of Rotational Motion

Appeared in Year: 2011

MCQ▾

Question

Figure below shows a small mass connected to a string, which is attached to a vertical post. If the ball is released when the string is horizontal as shown, the magnitude of the total acceleration (including radial and tangential) of the mass as a function of the angle θ is –

Small mass connected to string, which attached to vertical post

Small Mass Connected to String, Which Attached to Vertical Post

Figure shows a small mass connected to a string, which is attached to a vertical post. The ball is released when the string is horizontal and we have to find the magnitude of the total acceleration (including radial and tangential) of the mass as a function of the angle θ.

Choices

Choice (4) Response

a.

g3cos2θ+1

b.

gcosθ

c.

g3sin2θ+1

d.

gsinθ

Question number: 2

» Rotational Motion » Concepts of Rotational Motion

Appeared in Year: 2015

MCQ▾

Question

A uniform cylinder of mass M and radius R is rotated freely about a stationary horizontal axis O. On cylinder a cord of length l and mass m is wound in a single layer. The wound part of the cord is supposed to have it centre of gravity on the cylinder axis. The angular acceleration of the cylinder as a function of the length x of the hanging part of the cord is –

Choices

Choice (4) Response

a.

2mgxlR(M)

b.

mgxlR(M+m)

c.

mgxR(M+2m)

d.

2mgxlR(M+2m)

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