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Define Hole in Wall (Princeton)?
A container is separated into two parts I and II by a partition with a small hole of diameter d Helium gas in the two parts is held at temperatures T1 = 150 K and T2 = 300 K respectively, through heating of the walls.
a) How does the diameter d actuate the physical process by which the Gases come to steady state?
b) What is the ratio of the signify free paths λ1/λ2 between the two parts when d <<λ1 <<λ2?
c) What is the ratio when d >>λ1>>λ2?
Two bodies are moving in circular paths of equivalent radii. If the speed of the first body is twice that of the second, the centripetal acceleration of the first body is how
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in some case we take y=-g but in some case we take y=g... why???
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