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.)
Describe each of the following as a physical or chemical property
a. Neon is a colorless gas at room temperature.
b. Apple slices tum brown when they are exposed to air.
c. Phosphorus will ignite when exposed to air.
d. At room temperature, mercury is a liquid.
e. Propane gas is compressed to a liquid for placement in a small cylinder.
The label of an energy bar with a mass of lists the nutrition facts as of carbohydrate, of fat, and of protein.
Using the energy values for carbohydrates, fats, and proteins (see Table), what are the total kilocalories listed for the energy bar? (Round off answers for each food type to the tens place.)
What are the kilojoules for the energy bar? (Round off answers for each food type to the tens place.)
If you obtain , how many grams of the energy bar did you eat?
If you are walking and using energy at a rate of , how many minutes will you need to walk to expend the energy from two energy bars?
a. Water is healed to . What is the temperature of the hot water in degrees Celsius?
b. During extreme Hypothermia, a child's temperature dropped to . What was his temperature in degrees Fahrenheit?
Classify each of the following mixtures as homogeneous or heterogeneous:
al. Water and sand
b. mustard
c. blue ink
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