Answer to Question #200447 in Physics for Anton Oberholzer

Question

A completely sealed container, in the shape of a cube with side panels of length = 0.71 m, is full of carbonic ice at temperature -109.5 °C and placed in a room where the ambient temperature is 28.7 °C. The thickness of each (identical) panel of the container is 2.2 cm. In 1.2 day(s), an amount of 3073661 J of heat is conducted through the panels. Find the thermal conductivity of the material which the panels are made of.

Solar panels on one of the NWU solar car prototype, have an emissivity of e = 0.623. When in direct sunlight, they absorb energy at a rate of 1030 J/s per square meter of surface. Assume that the only energy loss is due to the emission of radiation. What equilibrium temperature are the panels reaching?

In a closed, insulated system, the vapour pressure of water at 15.16 °C is 4720 Pa. What percentage of the standard atmospheric pressure (1 atm) is this?

Answer 1

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