Work, Energy and Power (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 42  45 of 63
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Question number: 42
» Work, Energy and Power » Work Done
Question
The work done in pulling a body of mass 3 kg along an inclined plane (angle 60°) with coefficient of friction 0.2 through 2 m, will be 
Choices
Choice (4)  Response  

a.  98.08 J 

b.  56.80 J 

c.  56.08 J 

d.  65.08 J 

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Question number: 43
» Work, Energy and Power » Kinetic Energy
Question
Which of the following hold when two particles of masses m _{1} and m _{2} undergo elastic collision?
(1) When m, = m _{2} and m ^{2} is stationary, there is maximum transfer of kinetic energy in head on collision
(2) When m _{i} = va _{2} and m ^{2} is stationary, there is maximum transfer of momentum in head on collision
(3) When m _{l} > > m _{2} and m ^{2} is stationary, after head on collision m _{2} moves with twice the velocity of m _{1}
(4) When the collision is oblique and m _{1} = m _{2} with m _{2 } stationary, after the collision the particle move in opposite directions.
Select the correct answers and mark it according to the following codes
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1 and 2 are correct 

c.  1 and 3 are correct 

d.  1,2 and 3 are correct 

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Question number: 44
» Work, Energy and Power » Power
Question
The power output of a _{92} U ^{235} reactor if it takes 30 days to use up 2 kg of fuel and if each fission gives 185 MeV of energy (Avogadro number = 6 x 10 ^{23} /mole) will be –
Choices
Choice (4)  Response  

a.  58.4 MW 

b.  584 W 

c.  5.84 MW 

d.  5840 MW 

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Question number: 45
» Work, Energy and Power » Work Done
Question
A force F = (7  2x + 3x ^{2}) N is applied on a 2 kg mass which displaces it from x = 0 to x = 2 m. Work done in joule is 
Choices
Choice (4)  Response  

a.  7 

b.  3 

c.  2 

d.  13 

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