(a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount at heat transfer is measured. How many kilocalories per gram are there in a 5.00−g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100−kg aluminum cup, causing a 54 . 9 ° C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.
(a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount at heat transfer is measured. How many kilocalories per gram are there in a 5.00−g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100−kg aluminum cup, causing a 54 . 9 ° C temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.
(a) The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount at heat transfer is measured. How many kilocalories per gram are there in a 5.00−g peanut if the energy from burning it is transferred to 0.500 kg of water held in a 0.100−kg aluminum cup, causing a
54
.
9
°
C
temperature increase? (b) Compare your answer to labeling information found on a package of peanuts and comment on whether the values are consistent.
Thermography is a technique for measuring radiant heat and detecting variations in surface temperatures that may be medically, environmentally, or militarily meaningful.(a) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0ºC compared with that at 33.0ºC , such as on a person’s skin? (b) What is the percent increase in the rate of heat transfer by radiation from a given area at a temperature of 34.0ºC compared with that at 20.0ºC , such as for warm and cool automobile hoods?
A person inhales and exhales 2.00 L of 37.0ºC air, evaporating 4.00×10−2 g of water from the lungs and breathing passages with each breath. (a) How much heat transfer occurs due to evaporation in each breath?(b) What is the rate of heat transfer in watts if the person is breathing at a moderate rate of 18.0 breaths per minute?(c) If the inhaled air had a temperature of 20.0ºC , what is the rate of heat transfer for warming the air?(d) Discuss the total rate of heat transfer as it relates to typical metabolic rates. Will this breathing be a major form of heat transfer for this person?
A person inhales and exhales 2.00 L of 37.0C air, evaporating 4.00 X 10-2 g of water from the lungs and breathing passages with each breath. (a) How much heat transfer occurs due to evaporation in each breath? (b) What is the rate of heat transfer in watts if the person is breathing at a moderate rate of 18.0 breaths per minute? (c) If the inhaled air had a temperature of 20.0C, what is the rate of heat transfer for warming the air? (d) Discuss the total rate of heat transfer as it relates to typical metabolic rates. Will this breathing be a major form of heat transfer for this person?
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