Shivering. You have no doubt noticed that you usually shiver when you get out of the shower. Shivering is the body’s way of generating heat to restore its internal temperature to the normal 37°C, and it produces approximately 290 W of heat power per square meter of body area. A 68 kg (150 lb), 1.78 m (5 ft., 10 in.) person has approximately 1.8 m2 of surface area. How long would this person have to shiver to raise his or her body temperature by 1.0 C°, assuming that none of this heat is lost by the body? The specific heat of the body is about 3500 J/(kg·K).
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- 5 kg of fish (Cp =3600 J/KgK) is placed in a storage box that has A=0,45 m2 and k=0,025 W/mK. The storage box wall is 2 cm. The fish temperature within the box is -1°C when it is packed. a) how much heat goes through the storage box wall if it is forgotten outsite in 20°C b)How long time does it take the fish to get to the same temperature as the surronding.arrow_forwarda) A typical student listening attentively to a physics lecture has a heat output of 108 W. How much heat energy does a class of 95 physics students release into a lecture hall over the course of a 50 min lecture? Express your answer in joules. b) Assume that all the heat energy in part A is transferred to the 3204 m3 of air in the room. The air has a specific heat of 1020 J/(kg.K) and a density of 1.20 kg/m3. If none of the heat escapes and the air-conditioning system is off, how much will the temperature of the air in the room rise during the 50 min lecture? Express your answer in Celsius degrees. c) If the class is taking an exam, the heat output per student rises to 285 W. What is the temperature rise during 50 min in this case? Express your answer in Celsius degrees.arrow_forwardAir at 25 ° C blows over the hot steel plate whose surface temperature is maintained at 200 ° C. The plates are 50 cm x 40 cm in dimensions and 3 cm thick. The convection heat transfer coefficient on the upper surface is 30 W / (m² ° C). The thermal conductivity of steel is 45 W / (m ° C). Calculate the hourly heat loss from the plate surface. a. heat loss per hour = Answer kJ. b. If the reverse side surface temperature is maintained, determine the hourly heat loss incurred = Answer kJ.arrow_forward
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