作业帮At a birthday party,a student ate a piece of cake (food ener
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At a birthday party,a student ate a piece of cake (food energy value of 400 calories).To prevent this energy from being stored as fat,she decides to drink ice water at 0 C.She reasons that the ingested ice water will be warmed up to her normal body temperature of 37 C and absorb the energy.How much ice water would she have to drink to absorb the energy generated by metabolizing the birthday cake?
specific heat of water:1 cal/g*℃
400/[1*(37-0)]=10.81 g
再问： How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point? (Recall that 4.2 J = 1 calorie) do u know this one？
再答： specific heat of water: 4200 J/kg*℃ 4200*5*(100-20)=1680000J=1680kJ
再问： When you take a bath, how many kg of hot water (49 C) must you mix with cold water (13 C) so that the temperature of the bath is 36 C? The total mass of the water (hot and cold) is 191 kg.
400/[1*(37-0)]=10.81 g
再问： How many Joules of thermal energy must be added to 5 kg of water at 20 C to bring it to the boiling point? (Recall that 4.2 J = 1 calorie) do u know this one？
再答： specific heat of water: 4200 J/kg*℃ 4200*5*(100-20)=1680000J=1680kJ
再问： When you take a bath, how many kg of hot water (49 C) must you mix with cold water (13 C) so that the temperature of the bath is 36 C? The total mass of the water (hot and cold) is 191 kg.
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