When resting, a particular person has a resting metabolic rate of about 3.0 x 105 joules per hour.
The person is submerged neck-deep into a tub containing 1.2 x 103 kg of water at 21.0 °C. If the heat
from the person goes only into the water, find the water temperature after half an hour.
2006-12-20 12:26:54 · 1 answers · asked by ????????????????? 2 in Science & Mathematics ➔ Physics
A badly phrased question, since the water will remove heat much faster than the resting metabolic rate by simple conduction, and will chill the poor person down. However the question wants you to believe that the water will, magically, only take away heat as fast as it's generated internally (otherwise we couldn't solve the problem), so let's play out the fantasy. The water will receive half an hour's heat production, or 1.5*10^5 joules. Convert those units to calories and divide by the mass of the water; the result is the temperature change.
2006-12-20 13:10:49 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋