Question

1. Heat is the
   1. Total internal energy of an object
   2. Average kinetic energy of molecules
   3. Measure of potential energy of molecules
   4. Same thing as very high temperature
2. The specific heat of copper is 0.093 cal/g⁰C, and the specific heat of aluminum is 0.22  cal/g⁰C. The same amount of energy applied to equal masses, say, 50 g of copper and aluminum, will result in
   1. A higher temperature for copper
   2. A higher temperature for aluminum
   3. The same temperature for each metal
   4. Unknown results
3. The specific heat of water is 1 cal/g⁰C, and the specific heat of ice is 0.5 cal/g⁰C. The same amount of energy is applied to equal masses, say 50 g of water and ice, will result in (assume the ice does not melt)
   1. A greater temperature increase for the water
   2. A greater temperature increase for the ice
   3. The same temperature increase for each
   4. Unknown results
4. The transfer of heat takes place by the movement of groups of molecules with higher kinetic energy is
   1. Conduction
   2. Convection
   3. Radiation
   4. Sublimation
5. The transfer of heat that takes place directly from molecule to molecule is
   1. Conduction

1. Convection
2. Radiation
3. Sublimation

6. The transfer of heat that takes place by energy moving through space is
   1. Conduction

4. Convection
5. Radiation
6. Sublimation

7. The evaporation of water cools the surroundings, and the condensation of this vapor
   1. Does nothing
   2. Warms the surroundings
   3. Increases the value of the latent heat of vaporization
   4. Decreases the value of the latent heat of vaporization

8. The heat involved in the change of phase form solid ice to liquid water is
   1. Latent heat of vaporization
   2. Latent heat of fusion
   3. Latent heat of condensation
   4. None of the above
9. More molecules are returning to the liquid state than are leaving the liquid state. This process is called
   1. Boiling
   2. Freezing
   3. Condensation
   4. Melting
10. The temperature of a gas is proportional to the
    1. Average velocity of the gas molecules
    2. Internal potential energy of the gas
    3. Number of gas molecules in a sample
    4. Average kinetic energy of the gas molecules
11. The specific heat of soil is 0.2 cal/g⁰C, and the specific heat of water is 1 cal/g⁰C. This means that if 1 kg of soil and 1 kg of water each receives 1 kcal of energy, ideally,
    1. The water will be warmer than the soil by 0.8 ⁰C
    2. The soil will be 4 ⁰C warmer than the water
    3. The soil will be 5 ⁰C warmer than the water
    4. The water will warm by 1 ⁰C, and the soil will warm by 0.2 ⁰C
12. Styrofoam is a good insulating material because
    1. It is a plastic material that conducts heat poorly
    2. It contains many tiny pockets of air
    3. Of the structure of the molecules that make it up
    4. It is not very dense
13. As a solid undergoes a phase change to a liquid, it
    1. Releases heat while remaining at a constant temperature
    2. Absorbs heat while remaining at a constant temperature
    3. Releases heat as the temperature decreases
    4. Absorbs heat as the temperature increases
14. Which of the following contains the most heat
    1. A bucket of water at 0⁰C
    2. A barrel of water at 0⁰C
    3. Neither contains ay heat since the temperature is zero
    4. Both have the same amount of heat
15. Conduction best takes place in a
    1. Solid
    2. Fluid
    3. Gas
    4. Vacuum
16. Convection best takes place in a(an)
    1. Solid
    2. Fluid
    3. alloy
    4. Vacuum
17. The phase change from ice to liquid water takes place at
    1. Constant pressure
    2. Constant temperature
    3. Constant volume
    4. All of the above
18. Which of the following has the greatest value for liquid water?
    1. Latent heat of vaporization
    2. Latent heat of fusion
    3. Both are equivalent
    4. None of the above is correct

Question & Answer section 2 (4 pt. ea., 16 pts. total)

1. A 300 W immersion heater is used to heat 400 g of water from 10 ⁰C to 80 ⁰C. About how many minutes did this take?
   1. 5 min
   2. 3.5 min
   3. 2 min
   4. None of the above is correct
2. As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 9.5 cm², what is the total cross-sectional area of the capillaries feeding these venules? How many capillaries are involved if their average diameter is 10 micrometers?
   1. 38 cm² and 48,383,103 capillaries
   2. 40 cm² and 50,000,000 capillaries
   3. 310 cm² and 45,000,000 capillaries
   4. None of the above is correct
3. Hoover Dam on the Colorado River is the highest dam in the United States at 221 m, with an output of 1300 MW. The dam generates electricity with water taken from a depth of 150 m and an average flow rate of 700 m³/s. (a) Calculate the power in this flow. (b) What is the ratio of this power to the facility’s average of 680 MW?
   1. 955.5x10⁶ W and 2.12
   2. 1.029x10⁹ W and 1.51
   3. 955.5x10⁶ W and 1.41
   4. None of the above is correct
4. Calculate the retarding force due to the viscosity of the air layer between a cart and a level air track given the following information—air temperature is 20 ⁰C, the cart is moving at 0.500 m/s, its surface area is 3x10^-2 m², and the thickness of the air layer is 5x10^-5 m² . What is the ratio of this force to the weight of the 0.300-kg cart?
   1. 3.02x10^-3 N and 1.03x10^-3
   2. 1.03x10^-3 N and 1.5x10^-3
   3. 1.2x10^-2 N and 1x10^-3
   4. None of the above is correct

Answer 1

The answer for above problem is explained below.