Work, Energy and Power (NEET Physics): Questions 37 - 41 of 61

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Question number: 37

» Work, Energy and Power » Work Done

MCQ▾

Question

A uniform chain is held on a frictionless table with one-fifth of its length hanging over the edge. If the chain has a length l and a mass m, how much work is required to pull the hanging part back on the table?

Choices

Choice (4) Response

a.

mg l /2

b.

mg l /10

c.

mg l/5

d.

mg l /50

Question number: 38

» Work, Energy and Power » Power

MCQ▾

Question

A bus of mass 1000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 1000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 25 m/s, will respectively be –

Choices

Choice (4) Response

a.

1.0 m/s, 50 m/s 2

b.

5.0 m/s, 10 m/s 2

c.

50 m/s, 1.0 m/s 2

d.

10 m/s, 5m/s 2

Question number: 39

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

The stopping distance for a vehicle of mass M moving with a speed v along a level road, will be - (u is the coefficient of friction between tyres and the road)

Choices

Choice (4) Response

a.

V22μg

b.

Vμg

c.

V2μg

d.

2V2μg

Question number: 40

» Work, Energy and Power » Work Done

MCQ▾

Question

A force F = (9 - 4x + 6x 2) N is applied on a 2 kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is -

Choices

Choice (4) Response

a.

245

b.

135

c.

70

d.

270

Question number: 41

» Work, Energy and Power » Work Done

MCQ▾

Question

A boy pulls a 5 kg block 20 meters along a horizontal surface at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

Choices

Choice (4) Response

a.

11.55 J

b.

115 J

c.

163.32 J

d.

150 J

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