Rotational Motion (NEET Physics): Questions 16 - 21 of 123

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Question number: 16

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =- i + 2 j + 3 k acting at the point r = i + 3 j + 5k

Choices

Choice (4) Response

a.

-21i + 3j + 5k

b.

-i - 8j + 5k

c.

14i - 38j + 16k

d.

7i - 19j + 19k

Question number: 17

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =-3 i + j+5 k acting at the point r = 7 i + 3 j + k

Choices

Choice (4) Response

a.

-21i + 3j + 5k

b.

-l4i + 38j -16k

c.

4i + 4j + 6k

d.

14i - 38j + 16k

Question number: 18

» Rotational Motion » Angular Momentum

MCQ▾

Question

Two rigid bodies A and B rotate with rotational kinetic energies E A and E B respectively. The moments of inertia of A and B about the axis of rotation are I A and I B respectively. If I A = I B /4 and E A = 100 E B, the ratio of angular momentum (L A) of A to the angular momentum (L B) of B is

Choices

Choice (4) Response

a.

5

b.

25

c.

0.25

d.

1.25

Question number: 19

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =-2 i + j+3 k acting at the point r = 5 i + 3 j + 2k

Choices

Choice (4) Response

a.

14i - 38j + 16k

b.

-l4i + 38j -16k

c.

-21i + 3j + 5k

d.

7i - 19j + 19k

Question number: 20

» Rotational Motion » Angular Momentum

MCQ▾

Question

The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 3500 revolutions per minute. The angular acceleration of the wheel is

Choices

Choice (4) Response

a.

1880 degree/sec 2

b.

1500 rad/sec 2

c.

30 rad/sec 2

d.

1980 degree/sec 2

Question number: 21

» Rotational Motion » Angular Momentum

MCQ▾

Question

A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity co. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be

Choices

Choice (4) Response

a.

MωM+4m

b.

(M+4m)ωM

c.

Mω4m

d.

M4m)ωM+4m

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