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Physics problems: thermodynamics

work, heat, and temperature

 

Problem 1.

A rapidly spinning paddle wheel raises the temperature of 200mL of water from 21 degrees Celsius to 25 degrees. How much a) work is done and b) heat is transferred in this process?

Solution

 

Problem 6.

Even if a man shows no visible perspiration he still evaporates about 500 grams of water per day from his lungs. How many calories of heat are removed by this evaporation? What is the rate of heat loss in watts due to this process?

Solution

 

Problem 7.

One day the relative humidity is 90% and the temperature is 25 degrees Celsius. How many grams of water will condense out of each cubic meter of air if the temperature drops to 15 degrees Celsius? How many energy does the condensation from each cubic meter release?

Solution

 

Problem 9.

In lab you submerge 100 g of 40 degree Celsius nails in 100 g of 20 degree Celsius water. (The specific heat of iron is 0.45 J/g C). Find the final temperature of the water.

Solution

 

 

 

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