Physics Ch 21-22

what amount of heat is required to raise the temp of 150 grams of water by 20 C?

3000 calories

A good absorber of radiation is A. a good reflector B. a poor emitter of radiation C. a good emitter of radiation D. none of the above

A

During a very cold winter, water pipes sometimes burst. The reason for this is..? A. water expands when freezing B. water contracts when freezing C. the ground contracts when colder, pulling pipes apart D. the thawing process releases pressure on the pipes E. none of the above

A

If a poor absorber of radiation were a good emitter, its temp could remain A. lower than that of its surroundings B. greater than that of its surroundings C. the same as that of its surroundings

A

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

A

Newton's law of cooling says that the rate of cooling depends on A. the temp difference between an object and its surroundings B. the volume of an object C. the mass of an object D. the specific heat capacity of an object E. all of the above

A

Some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules would have..? A. high specific heat capacities B. low specific heat capacities

A

Temperature is related mostly to: A. average molecular kinetic energy in a substance B. total kinetic energy in something C. average energy in a substance D. total energy in something E. average kinetic energy of an object

A

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has a..? A. low specific heat capacity B. high specific heat capacity

A

Which cools at the faster rate, a pot of boiling water left at room temp or a pot of lukewarm water the same size left at room temp? A. the boiling water B. the lukewarm water C. neither-the cooling rate is the same for both

A

Which has the higher specific heat capacity, water or sand? A. water B. sand C. they both have the same

A

Which is denser, ice at 0 degrees C or water at 4 degrees C? A. the water B. the ice C. they both have the same density

A

Which temperature scale labels the freezing point of water at 0 degrees? A. Celsius B. Caloric C. Kelvin D. Fahrenheit E. none of the above

A

A bimetallic strip will bend when heated because..? A. metals bend when heated B. each metal expands at different rates C. each side of the strip is at a different temp D. metals contract when heated E. all of the above

B

A change in temp of 10 degrees C is equal to a change of.. A. -273 K B. 10 K C. 263 K D. 273 K E. 283 K

B

A cup of hot coffee will cool faster if it A. has cream in it B. is black

B

Global warming by the greenhouse effect mostly results from the fact that an atmosphere with excess carbon dioxide is less transparent to A. solar radiation B. terrestrial radiation C. neither of the above

B

Planet Earth loses heat primarily by A. conduction B. radiation C. convection D. all of these

B

Plastic foam is a good heat.. A. conductor B. insulator C. emitter D. absorber E. radiator

B

Which releases the most energy, 100 grams of 100 degrees C water cooling to 50 C, or 100 grams of iron at 100 C cooling to 50 C? (specific heat of iron is 0.12 cal/g C A. iron B. water C. both the same

B

Which, at the same temp, will cool more slowly on a hot day? A. dry beans B. watermelons C. potatoes D. bread E. all will cool at the same or similar rates

B

heat travels from the sun to Earth by A. conduction B. radiation C. convection D. insulation E. vacuumization

B

Heat is the...? A. average amount of energy per molecule contained in an object B. total amount of energy contained in an object C. energy transferred between objects because of a temperature difference D. amount of energy all the molecules have E. all of the above

C

The largest extremes in temp are usually experienced..? A. on islands B. near the oceans C. in the middle of a continent D. in Japan E. near large coastal cities like San Francisco

C

The reason an ocean's temp doesn't vary much from one season to the next is that..? A. oceans are located in mild regions of the Earth B. oceans are located next to large land areas C. water has a high specific heat capacity D. water has a low specific heat capacity E. there are a lot of fishes in the oceans

C

The reason fish live from year to year in ponds that freeze over in the winter is that..? A. fish are cold-blooded and can stand being frozen and thawed B. fish swim so fast they keep the water from freezing under the surface C. water below the ice is 4 degrees above freezing D. fish hibernate during the winter E. none of the above

C

the reason light-colored clothes help keep you cool int he warm weather is that clothes of light color A. weigh less B. have a lot of spaces in them C. reflect a lot of energy D. absorb energy, leaving little to pass through E. all of the above

C

Energy transfer by convection is primarily restricted to A. gases B. liquids C. solids D. fluids E. none of the above

D

Heat is measure in..? A. kilocalories B. joules C. calories D. all E. none

D

Heat transfer by conduction in metals occur 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 trough a vacuum D. electrons bump into atoms and other electrons E. none of the above

D

Heat transfer by convection occurs when.. A. electromagnetic waves travel from one place to another through a vacuum B. electrons bump into other electrons C. atoms give off heat in the form of electromagnetic waves D. large numbers of atoms move from place to place E. none of the above

D

if you were caught in freezing weather with only a candle for heat, you would be warmest in A. a tenet B. a wooden house C. a car D. an igloo

D

Specific heat capacity is related to the amount of internal energy..? A. transferred by one molecule B. one molecule contains C. a specific object has D. transferred by one object E. needed to change the temperature of one gram of a substance one degree

E

The reason sea breezes are usually from the sea toward the land during the day is that.. A. land is hotter than wetter B. cool air high over the ocean flows downward C. a high pressure area is created high above the water D. a low pressure area is created just over the shore E. all of the above

E

The reason you can hold your fingers beside a candle flame w/out getting hurt is that.. A. air convects heat well B. hot air rises C. air is a poor heat conductor D. hot-air convections currents travel upward E. all of the above

E

a bimetallic strip consists of two strips of the same material when welded together

false

a calorie is a common unit of force

false

gasses dont expand when heated

false

the total of all energies in a substance in its temp

false

heat is the energy that movies from one object to another because of a temp difference

true

liquids usually expand when heated

true

the amount of heat required to change the temp of a unit mass of a substance by 1 degree is its specific heat capacity

true

the average kinetic energy of molecules in a substance is related to temp

true