Work, Energy and Power (KVPY StreamSA (Class 11) Physics): Questions 9  14 of 25
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Question number: 9
» Work, Energy and Power » Potential Energy
Question
Potential energy of a spring when stretched by 8 cm is U. When stretched by 32 cm, its potential energy will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 10
» Work, Energy and Power » Kinetic Energy
Question
A ball of mass 5 kg is in motion and has a momentum 25 kgm/s. A force of 0.8 N acts on it along the direction of the motion for 20 s. The increase in its kinetic energy is,
Choices
Choice (4)  Response  

a.  118.5 J 

b.  105.6 J 

c.  91.5 J 

d.  127 J 

Question number: 11
» Work, Energy and Power » WorkEnergy Theorem
Question
The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation:
Where, x is in meter and t is sec. The work done by the force in first 4 sec is –
Choices
Choice (4)  Response  

a.  6 J 

b.  4 J 

c.  8 J 

d.  0 

Question number: 12
» Work, Energy and Power » Kinetic Energy
Question
A ball whose kinetic energy is E, is thrown at an angle of 30^{0} with the horizontal. Its kinetic energy at the highest point of its trajectory will be,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 13
» Work, Energy and Power » Kinetic Energy
Question
A ball whose kinetic energy is E, is thrown at an angle of 60^{0} with the horizontal. Its kinetic energy at the highest point of its trajectory will be,
Choices
Choice (4)  Response  

a. 


b.  0 

c. 


d. 


Question number: 14
» Work, Energy and Power » Power
Question
A person X of mass 81 kg walks up a stair case in 27 sec. Another person Y of mass 63 Kg walks up the same staircase in 7 sec. The ratio of the power generated by X to that by Y is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

