Liquid helium is stored at its boiling point temperature of, Physics

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Liquid helium is stored at its boiling point temperature of

Liquid helium is stored at its boiling point temperature of 4.2K in a spherical container (r=0.30 meter). The container is a perfect blackbody radiator. The container is surrounded by a spherical shield whose temperature is 87 K. A vacuum exists in the space between the shield and the container. The latent heat of vaporization for helium is 2.1x104 J/kg. Calculate what mass of liquid helium boils away through a venting valve in 1 hour?

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