Heat Quiz.

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Presentation transcript:

Heat Quiz

1- Which of the following is an example of slowing down heat transfer to improve human life? Heat is carried by convection currents in the atmosphere creating changes in weather. People sitting around a fireplace or campfire feel the warmth radiated to them from the fire. The metal in the engine of a car conducts heat through the coolant as people drive. People in cold weather wear several layers of clothes to prevent body heat loss.

2-4. Name the type of heat transfer occurring at each labeled part of the diagram below.

5. How is the heat transfer process at B different than at C? At B, the two objects must be touching for heat transfer to occur. At B, the heat from the fire is traveling in electromagnetic waves. At B, the hot water is rising and cold water is sinking.

6. Which of the following is an example of convection? Burning yourself on a hot stove burner. Sitting out in the sun and getting a sunburn. Hot air rising to take a balloon into the sky. Using electricity to turn a computer on.

7. A ___________ ____________ (2 words) is a circular motion caused by the rising of heated fluid.

8. If a match contains 890J of stored energy, then the match is lit, how much heat energy can reasonably be transferred to the wick of a candle to light it? About 890 J is transferred to heat because energy can’t be destroyed. About 400 J is transferred to heat because some of the energy is changed to light. About 89 J is transferred to heat because only about 10% goes from one level to the next.

9. What type of heat transfer takes place in a microwave oven?

10- What type of heat transfer takes place when vegetables are stir-fried?