Solve Physics Calc: Energy Expenditure for Adam's Water Intake

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When Adam drinks six glasses of cold water, his body needs to expend energy to raise the water's temperature from 0 degrees Celsius to 37 degrees Celsius. The total mass of the water consumed is 2.5 kilograms. The heat capacity of water is approximately 4.184 joules per gram per degree Celsius. Using this value, the energy expenditure required for warming the water is calculated to be around 390 kJ. This calculation illustrates the body's energy demands associated with temperature regulation after consuming cold liquids.
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When Adam drinks cold water, his body warms the water until thermal equilibrium is reached. If he drinks six glasses (2.5 kilograms) of water at 0 degrees Celsius in a day, approximately how much energy must his body expend to raise the temperature of this water to his body’s temperature of 37 degrees Celsius?
The answer is 390kJ. Can someone help me with the working please. Thx.
 
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warrior86 said:
When Adam drinks cold water, his body warms the water until thermal equilibrium is reached. If he drinks six glasses (2.5 kilograms) of water at 0 degrees Celsius in a day, approximately how much energy must his body expend to raise the temperature of this water to his body’s temperature of 37 degrees Celsius?
The answer is 390kJ. Can someone help me with the working please. Thx.

WHat is the heat capacity of water? i.e., how much energy is required to raise one kilogram of water by one degree Celsius?
 
The heat capacity was not given in the question but if we assume it to be pure water, the heat capcity of water can be taken as 4.184 joules/g-°C.
 
4.184 joules/(g°C) * 2.5 kg * 37 ° C = ... :)
 

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