# Physics Chapter 22

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e. fluids

### Which cools at the faster rate, a pt of boiling water left at room temperature or a pot of lukewarm water the same size left at room temperature? a. the lukewarm water b. the boiling water c. neither-the cooling rate is the same for both

b. the boiling water

### In a florist's greenhouse, glass acts as a one-way valve, letting a. low-frequency light in and preventing high-frequency radiation from escaping b. none of the above c. high-frequency light in and preventing low-frequency radiation from escaping

c. high-frequency light in and preventing low-frequency radiation from escaping

b. an igloo

a. all of these

True

### Firewalkers who walk barefoot on red-hot wooden coals depend on a. woods poor conductivity b. pure chance c. mind over matter

a. woods poor conductivity

### Newtons law of cooling says that the rate of cooling depends on a. the temperature difference between an object and its surroundings b. the volume of an object c. the mass of an object d. the specific heat capacity e. all of the above

a. the temperature difference between an object and its surroundings

b. insulator

False

True

d. fluids

False

### Heat transfer by conduction in metals occurs when a. atoms give off heat in the form of electromagnetic waves b. large numbers of atoms move from place to place c. electromagnetic waves travel from one place to another through a vacuum d. electrons bump into atoms and other electrons e. none of the above

d. electrons bump into atoms and other electrons

True

False

False

True

### Suppose you want to save energy, and you're going to leave your warm house for a half hour on a cold day. You should turn the thermostat a. down 10 degrees or more b. down a little c. up a little d. to room temperature

a. down 10 degrees or more

False

Example: