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Chapter 3: Q. 3.22 (page 73)
Discuss the changes in the potential and kinetic energy of a ski jumper taking the elevator to the top of the jump and going down the ramp.
The skier goes down the ramp, the P.E. is converted toK.E..
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For dinner, Charles had one cup of clam chowder, which contains of carbohydrate, of fat, and of protein. How much energy, in kilocalories and kilojoules, is in the clam chowder? (Round off the answer for each food type to the tens place.)
What type of change, physical or chemical, takes place in each of the following?
a. Pie dough is rolled into thin pieces for a crust.
b. A silver pin tarnishes in the air.
c. A tree is cut into boards at a saw mill.
d. Food is digested.
e. A chocolate bar melts.
What is in degrees Celsius and in keivins?
Using the energy values for foods (see Table), determine each of the following (round off the answer for each food type to the tens place):
(a) the total kilojoules for one cup of orange juice that contains 26 g of carbohydrate, no fat, and of protein
(b) the grams of carbohydrate in one apple if the apple has no fat and no protein and provides of energy
(c) the kilocalories in one tablespoon of vegetable oil, which containsof fat and no carbohydrate or protein
(d )the grams of fat in one avocado that has , of carbohydrate, and of protein
Identify each of the following changes of state as evaporation, boiling, or condensation:
a. At the water in at pan changes to steam.
b. On a cool morning, the windows in your car fog up.
C. A shallow pond dries up in the summer.
d. Your teakettle whistles when the water is ready for tea.
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