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in Physics by (50.3k points)

In gravity-free space, a particle is in contact with the inner surface of a hollow vertical cylinder and moves in a horizontal circular path along the surface. There is some friction between the particle and the surface. The retardation of the particle is

(a) zero 

(b) independent of its velocity 

(c) proportional to its velocity 

(d) proportional to the square of its velocity

2 Answers

+1 vote
by (51.1k points)
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Best answer

Correct Answer is: (d) proportional to the square of its velocity

The horizontal normal reaction of the wall on the particle is N = mv 2/r

The force of friction, F = μN = μmv2 / r .

The retardation, a = F/m = μv2 / r ∝ v2 .

0 votes
by (714 points)
Zero as gravity is absent, weoght force mg is absent

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