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Grade: upto college level
        
Riot police often use rubber bullets instead of lead bullets. Assume that neither bullet penetrates the skin, both have the same mass, time of contact, and initial speed. The difference is that the lead bullets "stick" while the rubber bullets bounce off. Which "hurts" more?
(A) The lead bullet
(B) The rubber bullet
(C) The bullets hurt the same amount.
(D) It depends on where you get hit.
5 years ago

Answers : (3)

udit maniyar
46 Points
							
The Rubber bullet hurts the more 
Because force =change in momemtum per time
Time of contact is same 
If intial momemtum of both the bullets is p
Then the change in momemtum of rubber bulllet is 2p and change in momemtum of lead bullet is p Therefore force applied by rubber bullet is more
 
Approve if useful
 
5 years ago
Kevin Nash
askIITians Faculty
332 Points
							The correct option is (A) the lead bullet.
Since the lead bullet stick, the momentum of the lead bullet fully transfer to the skin but in the case of rubber bullet since it is bounce back, the momentum of the rubber bullet is not fully transferred. Therefore, the amount of momentum transfer to the skin in the case of rubber bullet is less than the lead bullet. Thus the lead bullet hurts despite from their same mass with the rubber bullet.
From the above observation we conclude that, option (A) is correct.
5 years ago
udit maniyar
46 Points
							
what is the final answer?
 
5 years ago
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  • Previous Year Exam Questions


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