Question

on 15 of 17 > A 1.88-m (6 ft 2 in.) man has a mass of 95 kg, a body surface area of 2.1 m², and a skin temperature of 34.5 °C. Normally, 80% of the food calories he consumes go to heat; the rest goes to mechanical energy. His emissivity e is 1 because his body radiates almost entirely nonvisible infrared energy, which is not affected by skin pigment. (Careful! His body at 34.5 °C radiates into the environment at 20.0*C, but the environment also radiates back into his body. The net rate of radiation is Pnet = Rody - Penvironment.) To keep his body's temperature constant, how many food calories should he eat per day if he is in a room at 20.0 °C and he loses heat only through radiation? food calories per day = C/day Does the answer seem reasonable? Yes O No

Answer 1

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A 189 m tal man has a mass 95 K and e body hau a Buntace anea 2.1 m aud Jhe man hau Ihe Skin Hempareture C21-5+215)K 94.5 C energy amout stma diation ermiia per Now the Second d8 -2 5.67X10x 2.1x -7 187 Jule /Secand 1 and 201. rechamial NOW 801 Convetid ulheat emergy 1f Total emergy Teyured =* Jule /second 187 100 Heat Loss+ Mechamica emerg Jhe ammout st emergy Teured to mantane 2 33.7S Jule1second a Constaut temparetwe 20'c. = (233.75 x 24x 36 D0) Jule. - 2.02x10 Jule. K Cal 4826.95 4827 Kilo Calorie 4827 Kilo Galories foool is resmuredd to Comstant temparetme. maintavin a ihis amsuor is mot Tesonal le as ihe average emeray T2amred per heuman 3000-3500 a