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Question (11)

QN0035332

A particle of mass is moving in a circle of radius with , then its angular momentum is :

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

Angular momentum,

Particle in circular motion moving with constant speed.

Direction will be upward & speed remains constant.

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Question (12)

QN0035333

A wheel having angular momentum about its vertical axis, rotates at the rate of about this axis, The torque which can stop the wheel's rotation in would be

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Angular momentum will be conserved

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Question (13)

QN0035334

Angular momentum of a single particle moving with constant speed along circular path:

(A)
changes in magnitude but remains same in the direction
(B)
remains same in magnitude and direction
(C)
remains same in magnitude but changes in the direction
(D)
is zero

Correct Answer: B

Explanation:

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Question (14)

QN0035335

A round disc of moment of inertia about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia rotating with an angular velocity about the same axis. The final angular velocity of the combination of discs is

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

Only the transverse component contributes to the torque.

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Question (15)

QN0035336

Four point masses, each of mass , are fixed at the corners of a square of side . The square is rotating with angular frequency , about an axis passing through one of the corners of the square and parallel to its diagonal, as shown in the figure. The angular momentum of the square about this axis is :

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

A couple can produce rotational motion only and not linear motion.

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Question (16)

QN0035337

Which component of force contributes to the torque?

(A)
Radial component
(B)
Transverse component
(C)
Both (a) and (b)
(D)
Either radial or transverse

Correct Answer: B

Explanation:

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Question (11)

A particle of mass is moving in a circle of radius with , then its angular momentum is :

Explanation:

Link:

Question (12)

A wheel having angular momentum about its vertical axis, rotates at the rate of about this axis, The torque which can stop the wheel's rotation in would be

Explanation:

Link:

Question (13)

Angular momentum of a single particle moving with constant speed along circular path:

Explanation:

Link:

Question (14)

A round disc of moment of inertia about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia rotating with an angular velocity about the same axis. The final angular velocity of the combination of discs is

Explanation:

Link:

Question (15)

Explanation:

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Question (16)

Which component of force contributes to the torque?

Explanation:

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