The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant K and compresses it by length L. The maximum momentum of the block after collision is 

(1) Zero

(2) ML2K

(3) MKL

(4) KL22M

Subtopic:  Elastic Potential Energy |
 71%
From NCERT
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A body of mass m accelerates uniformly from rest to v1 in time t1. As a function of time t, the instantaneous power delivered to the body is 

(1) mv1tt1

(2) mv12tt1

(3) mv1t2t1

(4) mv12tt12

Subtopic:  Power |
 54%
From NCERT
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A weight lifter lifts 300 kg from the ground to a height of 2 meter in 3 second. The average power generated by him is 

(1) 5880 watt

(2) 4410 watt

(3) 2205 watt

(4) 1960 watt

Subtopic:  Power |
 76%
From NCERT
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The average power required to lift a 100 kg mass through a height of 50 metres in approximately 50 seconds would be 

(1) 50 J/s

(2) 5000 J/s

(3) 100 J/s

(4) 980 J/s

Subtopic:  Power |
 84%
From NCERT
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The power of a pump, which can pump 200kg of water to a height of 200m in 10sec is (g = 10 m/s2) 

(1) 40 kW

(2) 80 kW

(3) 400 kW

(4) 960 kW

Subtopic:  Power |
 82%
From NCERT
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A 60 kg man runs up a staircase in 12 seconds while a 50 kg man runs up the same staircase in 11, seconds, the ratio of the rate of doing their work is 

(1) 6 : 5

(2) 12 : 11

(3) 11 : 10

(4) 10 : 11

Subtopic:  Power |
 77%
From NCERT
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What average horsepower is developed by an 80 kg man while climbing in 10 s a flight of stairs that rises 6 m vertically 

(1) 0.63 HP

(2) 1.26 HP

(3) 1.8 HP

(4) 2.1 HP

Subtopic:  Power |
 76%
From NCERT
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A quarter horse-power motor runs at a speed of 600 rpm. Assuming 40% efficiency, the work done by the motor in one rotation will be: 

1. 7.46 J

2. 7400 J

3. 7.46 ergs

4. 74.6 J

Subtopic:  Power |
 54%
From NCERT
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An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that the efficiency of the engine is 60% . If g = 10 ms–2, the power of the engine is

(1) 3.3 kW

(2) 0.33 kW

(3) 0.033 kW

(4) 33 kW

Subtopic:  Power |
 67%
From NCERT
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An engine pump is used to pump a liquid of density ρ continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is

(1) 12Aρv3

(2) 12Aρv2

(3) 12Aρv

(4) Aρv

Subtopic:  Work Energy Theorem |
 72%
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