university physics
posted by jane .
A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudoblackbody, and that the shell has an effective area of 0.615 m2 and is at 3.01ยท102 K.
a) Determine the rate of heat loss due to radiation.
(in W)
b) What is the rate at which the volume of the liquid helium in the container decreases as a result of boiling off? The latent heat of vaporization of liquid helium is 20.9 kJ/kg. The density of liquid helium is 0.125 kg/L.

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