A recruit can join the semi-secret “300 F” club at the Amundsen–Scott South Pole Station only when the outside temperature is below −70°C. On such a day, the recruit first basks in a hot sauna and then runs outside wearing only shoes. (This is, of course, extremely dangerous, but the rite is effectively a protest against the constant danger of the cold.) Assume that upon stepping out of the sauna, the recruit’s skin temperature is 102°F and the walls, ceiling, and floor of the sauna room have a temperature of 30°C. Estimate the recruit's surface area, and take the skin emissivity to be 0.80. (a) What is the approximate net rate P net at which the recruit loses energy via thermal radiation exchanges with the room? Next, assume that when outdoors, half the recruit’s surface area exchanges thermal radiation with the sky at a temperature of −25°C and the other half exchanges thermal radiation with the snow and ground at a temperature of −80°C. What is the approximate net rate at which the recruit loses energy via thermal radiation exchanges with (b) the sky and (c) the snow and ground?
A recruit can join the semi-secret “300 F” club at the Amundsen–Scott South Pole Station only when the outside temperature is below −70°C. On such a day, the recruit first basks in a hot sauna and then runs outside wearing only shoes. (This is, of course, extremely dangerous, but the rite is effectively a protest against the constant danger of the cold.) Assume that upon stepping out of the sauna, the recruit’s skin temperature is 102°F and the walls, ceiling, and floor of the sauna room have a temperature of 30°C. Estimate the recruit's surface area, and take the skin emissivity to be 0.80. (a) What is the approximate net rate P net at which the recruit loses energy via thermal radiation exchanges with the room? Next, assume that when outdoors, half the recruit’s surface area exchanges thermal radiation with the sky at a temperature of −25°C and the other half exchanges thermal radiation with the snow and ground at a temperature of −80°C. What is the approximate net rate at which the recruit loses energy via thermal radiation exchanges with (b) the sky and (c) the snow and ground?
A recruit can join the semi-secret “300 F” club at the Amundsen–Scott South Pole Station only when the outside temperature is below −70°C. On such a day, the recruit first basks in a hot sauna and then runs outside wearing only shoes. (This is, of course, extremely dangerous, but the rite is effectively a protest against the constant danger of the cold.)
Assume that upon stepping out of the sauna, the recruit’s skin temperature is 102°F and the walls, ceiling, and floor of the sauna room have a temperature of 30°C. Estimate the recruit's surface area, and take the skin emissivity to be 0.80. (a) What is the approximate net rate Pnet at which the recruit loses energy via thermal radiation exchanges with the room? Next, assume that when outdoors, half the recruit’s surface area exchanges thermal radiation with the sky at a temperature of −25°C and the other half exchanges thermal radiation with the snow and ground at a temperature of −80°C. What is the approximate net rate at which the recruit loses energy via thermal radiation exchanges with (b) the sky and (c) the snow and ground?
In contrast to Venus, the coldest temperature yet measured on the surface of
any body in the solar system is -235°C. This temperature was detected by
Voyager 2 as it passed by Neptune's largest moon, Triton. What is Triton's
surface temperature in degrees Fahrenheit and in kelvins?
The warmest temperature in Antarctica was recorded at the Vanda Station on
the Scott Coast. On January 5, 1974 early summer in the southern
hemisphere-a high temperature of 15°C was reached. Express this
temperature in degrees Fahrenheit and kelvins.
Answer must be given as calculated
and then to the side given in
significant figure answer format
The highest surface temperature, on any of the solar system's planets is found
on Venus. Partly because of its nearness to the sun and partly because of the
extreme pressure of its atmosphere, the average daytime temperature on Venus
is 453°C. What is this temperature in degrees Fahrenheit and in kelvins?
In contrast to Venus, the coldest temperature yet measured on the surface of
any body in the solar system is -235°C. This temperature was detected by
Voyager 2 as it passed by Neptune's largest moon, Triton. What is Triton's
surface temperature in degrees Fahrenheit and in kelvins?
The warmest temperature in Antarctica was recorded at the Vanda Station on
the Scott Coast. On January 5, 1974-early summer in the southern
hemisphere-a high temperature of 15°C was reached. Express this
temperature in degrees Fahrenheit and kelvins.
Answer must be given as calculated
and then to the side given in
significant figure answer format
The average temperature of the atmosphere has increased by 0.4°C over the last thirty years. Estimate how much energy has gone into warming up the planet in this way. Keep in mind that the atmosphere has a mass of 5 × 1018kg, and the specific heat capacity of air is about 1 Jg−1K−1.
How do we get to this answer (2×1021J)
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