Thank you for your help!! Nome Date CONCEPTUAL Physical SciEnce PIAGTIC Chapter

Question

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Nome Date CONCEPTUAL Physical SciEnce PIAGTIC Chapter 7: Heat Transfer and Change of Phase Transmission of Heat 1. The tips of both brass rods are held in the gas flame Mark the folowing true (T) or false (F) a. Heat is conducted only along Rod A b. Heat is conducted only along Rod B c. Heat is conducted equally along both WILL HEAT MOVE UPWARD, PHYSES WILL IT FLOW DOWNWARD 8 Rod A and Rod B d. The idea that "heat rises" applies to heat transfer by convection, not by conduction. 2. Why does a bird fluff its feathers to keep warm on a cold day? Why does a down-filled sleeping bag keep you warm on a cold night? Why is it useless if the down is wet? 3. 4, What does convection have to do with the holes in the shade of the desk lamp? 5. When hot water rapidly evaporates, the result can be dramatic. Consider 4 g of boiling water spread over a large surface so that 1 g rapidly evaporates. Suppose are very cold so that all 540 calories for evaporation come from the remaining 3 g of water a. How many calories are taken from each gram of water? b. How many calories are released when 1 g of 100°C water cools to o'c? c. How many calories are released when 1 g of water changes to ? d. What happens in this case to the remaining 3 g of boiling water when 1 g rapidly evaporates?

Explanation / Answer

1

a. False

b. False

c. True

d. True

2.

the bird does so to avoid loosing heat by mean of convection, it collects air doing this and air acts as insulator and prevents losing of heat.

3.

the sleeping bags has air in it which acts as insulator and thus prevents conduction of heat. if the down is wet, the water is conductor of heat , hence it becomes useless.

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