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Physical Science, 5/e
Bill Tillery, Arizona State University
Heat and Temperature

Exercises

  1. The average human body temperature is 98.6°F. What is the equivalent temperature on the Celsius scale?Answer
  2. An electric current heats a 221 g copper wire from 20.0°C to 38.0°C. How much heat was generated by the current?Answer(ccopper 5 0.093 kcal/kgC°)
  3. A bicycle and rider have a combined mass of 100.0 kg. How many calories of heat are generated in the brakes when the bicycle comes to a stop from a speed of 36.0 km/hr?Answer
  4. A 15.53 kg loose bag of soil falls 5.50 m at a construction site. If all the energy is retained by the soil in the bag, how much will its temperature increase?Answer(csoil 5 0.200 kcal/kgC°)
  5. A 75.0 kg person consumes a small order of french fries (250.0 Cal) and wishes to "work off" the energy by climbing a 10.0 m stairway. How many vertical climbs are needed to use all the energy?Answer
  6. A 0.5 kg glass bowl (cglass 5 0.2 kcal/kgC°) and a 0.5 kg iron pan (ciron 5 0.11 kcal/kgC°) have a temperature of 68°F when placed in a freezer. How much heat will the freezer have to remove from each to cool them to 32°F?Answer
  7. A sample of silver at 20.0°C is warmed to 100.0°C when 896 cal is added. What is the mass of the silver?Answer(csilver 5 0.056 kcal/kgC°)
  8. A 300.0 W immersion heater is used to heat 250.0 g of water from 10.0°C to 70.0°C. About how many minutes did this take?Answer
  9. A 100.0 g sample of metal is warmed 20.0°C when 60.0 cal is added. What is the specific heat of this metal?Answer
  10. How much heat is needed to change 250.0 g of ice at 0°C to water at 0°C?Answer
  11. How much heat is needed to change 250.0 g of water at 80.0°C to steam at 100.0°C?Answer
  12. A 100.0 g sample of water at 20.0°C is heated to steam at 125.0°C. How much heat was absorbed?Answer
  13. In an electric freezer, 400.0 g of water at 18.0°C is cooled, frozen, and the ice is chilled to 25.00°C. (a) How much total heat was removed from the water?Answer (b) If the latent heat of vaporization of the Freon refrigerant is 40.0 cal/g, how many grams of Freon must be evaporated to absorb this heat?Answer
  14. A heat engine is supplied with 300.0 cal and rejects 200.0 cal in the exhaust. How many joules of mechanical work was done?Answer
  15. A refrigerator removes 40.0 kcal of heat from the freezer and releases 55.0 kcal through the condenser on the back. How much work was done by the compressor?Answer








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