Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 42  45 of 63
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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 

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 

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 

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 
