Subunit 3-4: Rate in Thermal Systems

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1. Heat-flow rate is the amount of _______________ transferred through a substance in a unit of time. *

heat capacity

specific heat

thermal conductivity

heat energy

2. A common English unit for heat-flow rate is _________________. *

miles/hr

gal/hr

ft/min

btu/hr

3. Heat always from a _______________ region to a __________ region. *

warm, cool

cool, warm

4. A heater that produces 30,000 Btu of heat energy in 12 hours would have a heat-flow rate equal to _______________. *

360,000 Btu/hr

2500 Btu/hr

150,000 Btu/hr

41.67 Btu/hr

5. Identify the meaning of the symbol shown in your Student Journal for #5. *

temperature difference across the substance

uniform thickness of substance

area of substance

thermal conductivity constant (characteristic of the substance)

heat-flow rate through a substance.

6. Identify the meaning of the symbol shown in your Student Journal for #6. *

temperature difference across the substance

uniform thickness of substance

area of substance

thermal conductivity constant (characteristic of the substance)

heat-flow rate through a substance.

7. Identify the meaning of the symbol shown in your Student Journal for #7. *

temperature difference across the substance

uniform thickness of substance

area of substance

thermal conductivity constant (characteristic of the substance)

heat-flow rate through a substance.

8. Identify the meaning of the symbol shown in your Student Journal for #8. *

temperature difference across the substance

uniform thickness of substance

area of substance

thermal conductivity constant (characteristic of the substance)

heat-flow rate through a substance.

9. A calorie is a unit of _________________. *

heat capacity

specific heat

thermal conductivity

heat energy

10. The specific heat of water is _________________. *

1 calorie per C degree

1 BTU per pound

1 calorie per g C degree

1 joule per kg

11. In the formula, H = mc*change in T, the letter "c" represents the... *

mass of the substance

heat capacity of the substance

weight of the substance

specific heat of the substance

12. When a substance (such as water) goes from a solid to a liquid without change in temperature, the heat added during the transformation is... *

sensible heat

latent heat

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