Laws of Motion (NEET Physics): Questions 43 - 47 of 114

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Question number: 43

» Laws of Motion » Force and Inertia

MCQ▾

Question

A stone of mass 1 kg tied to a light inextensible string of length L = 40/3 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec 2, the speed of the stone at the highest point of the circle is

Choices

Choice (4) Response

a.

20 m/sec

b.

5√2m/sec

c.

10√3m/Sec

d.

10 m/sec

Question number: 44

» Laws of Motion » Force and Inertia

MCQ▾

Question

A body of mass m tied at the end of a string of length i is projected with velocity 4lg , at what height will it leave the circular path –

Choices

Choice (4) Response

a.

23l

b.

53l

c.

35l

d.

13l

Question number: 45

» Laws of Motion » Force and Inertia

MCQ▾

Question

particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k 2 rt 2, where k is a constant. The power delivered to the particle by the force acting on it will be

Choices

Choice (4) Response

a.

mk 2 t 2 r

b.

mk 2 t 2 r 2

c.

mk 2 r 2 t

d.

m 2 k 2 t 2 r 2

Question number: 46

» Laws of Motion » Force and Inertia

MCQ▾

Question

A 4 kg balls is swing in a vertical circle at the end of a cord 1 m long. The maximum speed at which it can swing if the cord can sustain maximum tension of 163.6 N will be –

Choices

Choice (4) Response

a.

36 m/s

b.

8 m/s

c.

6 m/s

d.

64 m/s

Question number: 47

» Laws of Motion » Force and Inertia

MCQ▾

Question

A mass of 60 kg is on the floor of a lift moving down. The lift moves at first with an acceleration of 3 m/sec 2, then with constant velocity and finally with a retardation of 3m/sec2. Choose the correct options related to possible reactions exerted by the lift on the body in each part of the motion –

Select the correct answers and mark it according to the following

  1. 408 N
  2. 588 N
  3. 768 N
  4. 508 N

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

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