A bullet makes n turns inside the barrel of length l λ of a rifle and emerges from it with a speed v. Assuming that the bullet moves inside the barrel with a uniform acceleration, the angular velocity of the bullet about its longitudinal axis as it emerges from the barrel is
A
B
C
D
None of these
Text Solution
Verified by ExpertsThe correct answer is:
B
v = at , ω ω = α α t
2 π π n = 
α α t 2
l λ = 
at 2 ⇒ ⇒ 
= 
ω ω = 
v , Hence, is correct.
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