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Physics problems: thermodynamics

Solids, liquids, and gases: phase

 

changes

 

Problem 3.

How many btu are needed to change 10 pounds of ice at 5 degree Fahrenheit to steam at 250 degree Fahrenheit?

Solution

 

Problem 5.

An ice cube having a mass of 50 grams and an initial temperature of -10 degrees Celsius is placed in 400 grams of 40 degrees Celsius water. What is the final temperature of the mixture if the effects of the container can be neglected?

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 8.

100 grams of ice at -15 degrees C are placed in a container.  How much heat in joules must be added to do the following?
(1) Raise the temperature of the ice to 0 degrees C;
(2) Melt the ice;
(3) Heat water from 0 degrees C to 100 degrees C;
(4) Change water to steam.

Solution

 

 

 

 

 

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