Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 33  36 of 63
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Question number: 33
» Work, Energy and Power » Work Done
Question
Choose the correct options 
(1) The work done by forces may be equal to change in kinetic energy
(2) The work done by forces may be equal to change in potential energy
(3) The work done by forces may be equal to change in total energy
(4) The work done by forces must be equal to change in potential energy.
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  1 and 3 are correct 

c.  1 and 2 are correct 

d.  2 and 4 are correct 

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Question number: 34
» 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 = 5 m. Work done in joule is 
Choices
Choice (4)  Response  

a.  35 

b.  135


c.  270 

d.  70 

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Question number: 35
» Work, Energy and Power » Potential Energy
Question
A body of mass 1 kg initially at rest explodes and breaks into three fragments of masses in the ratio 1: 1: 3. The two pieces of equal mass fly off perpendicular to each other with a speed of 30 m/sec each. What is the velocity of the heavier fragment?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 36
» Work, Energy and Power » Potential Energy
Question
A particle of mass 4 m which is at rest explodes into three fragments two of the fragments each of mass m are found to move each with a speed v making an angle 90° with each other. The total energy released in this explosion is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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