1)You may have noticed that when you get out of a swimming pool and stand drippi

Question

1)You may have noticed that when you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this?

A) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body.

B) The moisture on your skin has good thermal conductivity.

C) Water has a relatively large heat capacity.

D) The water on your skin is colder than the surrounding air.

E) This is a purely psychological effect resulting from the way in which sensory nerves in the skin are stimulated. ,

2)How much heat must be added to a 8 kg block of ice at -8°C to change it to water at

A) 830 kcal

B) 140 kcal

C) 780 kcal

D) 810 kcal

E) 180 kcal ,

3)Heat energy travels from an object with a high

A) internal energy to an object with a lower internal energy.

B) temperature to an object with a lower temperature.

C) Both of these, for they say essentially say the same thing.

D) None of the above choices are true. ,

4)Which of the following normally warms up fastest when heat is applied?

A) glass

B) water

C) wood

D) iron

E) All of the above choices are equally true. ,

5)Compared to a giant iceberg, a hot cup of coffee has

A) higher temperature, but less internal energy.

B) more internal energy and higher temperature.

C) a greater specific heat and more internal energy.

D) none of these

Explanation / Answer

1) 540 calories of heat are required to evaporate each gram of water from your skin, and most of this heat flows out of your body

2) insufficient data

3) b

4) iron

5) higher temperature, but less internal energy

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