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 2.
The temperature of a body is increased from 173 C to 357 C. What is the ratio of energies emitted by the body per second in these two cases?
Solution
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 4.
If ice has a density of , then what is the volume of 5,000 g of ice?
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
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
Problem 10.
A copper cylinder is initially at 20.0 degrees Celsius at what temperature will its volume be 0.15% larger than it is at 20.0 degrees Celsius.
Solution
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