Basal metabolic rate. The energy output of an animal engaged in an activity is called the basal metabolic rate (BMR) and is a measure of the conversion of food energy into other forms of energy. A simple calorimeter to measure the BMR consists of an insulated box with a thermometer to measure the temperature of the air. The air has a density of 1.29 kg/m 3 and a specific heat of 1020 J/(kg·K). A 50.0 g hamster is placed in a calorimeter that contains 0.0500 m 3 of air at room temperature. (a) When the hamster is running in a wheel, the temperature of the air in the calorimeter rises 1.8 C° per hour. How much heat does the running hamster generate in an hour? (Assume that all this heat goes into the air in the calorimeter. Ignore the heat that goes into the walls of the box and into the thermometer, and assume that no heat is lost to the surroundings.) (b) Assuming that the hamster converts seed into heat with an efficiency of 10%. and that hamster seed has a food energy value of 24 J/g, how many grams of seed must the hamster eat per hour to supply the energy found in part (a)?
Basal metabolic rate. The energy output of an animal engaged in an activity is called the basal metabolic rate (BMR) and is a measure of the conversion of food energy into other forms of energy. A simple calorimeter to measure the BMR consists of an insulated box with a thermometer to measure the temperature of the air. The air has a density of 1.29 kg/m 3 and a specific heat of 1020 J/(kg·K). A 50.0 g hamster is placed in a calorimeter that contains 0.0500 m 3 of air at room temperature. (a) When the hamster is running in a wheel, the temperature of the air in the calorimeter rises 1.8 C° per hour. How much heat does the running hamster generate in an hour? (Assume that all this heat goes into the air in the calorimeter. Ignore the heat that goes into the walls of the box and into the thermometer, and assume that no heat is lost to the surroundings.) (b) Assuming that the hamster converts seed into heat with an efficiency of 10%. and that hamster seed has a food energy value of 24 J/g, how many grams of seed must the hamster eat per hour to supply the energy found in part (a)?
Basal metabolic rate. The energy output of an animal engaged in an activity is called the basal metabolic rate (BMR) and is a measure of the conversion of food energy into other forms of energy. A simple calorimeter to measure the BMR consists of an insulated box with a thermometer to measure the temperature of the air. The air has a density of 1.29 kg/m3 and a specific heat of 1020 J/(kg·K). A 50.0 g hamster is placed in a calorimeter that contains 0.0500 m3 of air at room temperature. (a) When the hamster is running in a wheel, the temperature of the air in the calorimeter rises 1.8 C° per hour. How much heat does the running hamster generate in an hour? (Assume that all this heat goes into the air in the calorimeter. Ignore the heat that goes into the walls of the box and into the thermometer, and assume that no heat is lost to the surroundings.) (b) Assuming that the hamster converts seed into heat with an efficiency of 10%. and that hamster seed has a food energy value of 24 J/g, how many grams of seed must the hamster eat per hour to supply the energy found in part (a)?
A building science major is investigating energy loss through windows. The windowpane of interest is 0.950 cm thick, has dimensions of 0.88 m ✕ 2.30 m, and has a thermal conductivity of 0.8 W/(m · °C). On a given cold day, the outside temperature is 0°C and the temperature of the interior surface of the glass is 28.0°C.
(a)Determine the rate (in W) at which heat energy is transferred through the window.
Answer- W
(b)Determine the amount of energy (in J) transferred through the window in one day, assuming the temperature on the surfaces remains constant.
Answer- J
An energy technician is investigating energy loss through windows. The windowpane of interest is 0.500 cm thick, has dimensions of 1.02 m ✕ 2.05 m, and has a thermal conductivity of 0.8 W/(m · °C). On a given cold day, the outside temperature is 0°C and the temperature of the interior surface of the glass is 26.0°C.
(a) Determine the rate (in W) at which heat energy is transferred through the window (in W)
b.) determine the amount of energy in J transferred through the window in one day assuming the temperature on the surfaces remain constant
The tube in a heat exchanger has a 2-in inner diameter and a 3-in outer diameter. The thermal conductivity of the tube material is 0.5 Btu/h·ft·°F, while the inner surface heat transfer coefficient is 50 Btu/h·ft2·°F and the outer surface heat transfer coefficient is 10 Btu/h·ft2·°F. Determine the overall heat transfer coefficients based on the outer and inner surfaces.
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