A physicist uses a cylindrical metal can 0.350 m high and 0.090 m in diameter to store liquid helium at 4.22 K, at that temperature the heat of vaporization of helium is 2.09 x 10 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls Part A How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation, Express your answer in gram per hour. Am At Submit ΤΕΙ ΑΣΦ Request Answer 1 g/h
A physicist uses a cylindrical metal can 0.350 m high and 0.090 m in diameter to store liquid helium at 4.22 K, at that temperature the heat of vaporization of helium is 2.09 x 10 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K, with vacuum between the can and the surrounding walls Part A How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation, Express your answer in gram per hour. Am At Submit ΤΕΙ ΑΣΦ Request Answer 1 g/h
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Transcribed Image Text:A physicist uses a cylindrical metal can 0.350 m high and 0.090 m
in diameter to store liquid helium at 4.22 K; at that temperature the
heat of vaporization of helium is 2.09 x 104 J/kg. Completely
surrounding the metal can are walls maintained at the temperature
of liquid nitrogen, 77.3 K, with vacuum between the can and the
surrounding walls.
Part A
How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by
radiation.
Express your answer in gram per hour.
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