Reading Quiz - Heat. 1. Heat is ___ 1. measured in joules. ___ 2. a form of energy. ___ 3. measured in calories. ___ 4. all of the above. 2. When a material changes phase, ___ 1. heat is given off. ___ 2. heat is absorbed. ___ 3. its temperature remains constant.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
1. Heat is
___ 1. measured in joules.
___ 2. a form of energy.
___ 3. measured in calories.
___ 4. all of the above.
___ 1. heat is given off.
___ 2. heat is absorbed.
___ 3. its temperature remains constant.
___ 4. it changes some physical characteristics.
___ 5. all of the above.
___ 1. conduction.
___ 2. convection.
___ 3. radiation.
___ 4. all of the above.
1) The natural direction of the heat flow between two objects depends on
____ a) their temperatures.
____ b) their internal energy contents.
____ c) their pressures.
____ d) whether they are in the solid, liquid, or gaseous state.
____ a) During the last 3 minutes, 15 J of heat was transferred to the cold drink from the room.
____ b) This cup of coffee has 450 calories of heat.
____ c) A cup of hot water contains less internal energy than a cold swimming pool.
____ d) Mechanical work can be converted into heat.
1) An 80 kg weight-watcher wishes to climb a mountain to work off the equivalent of a large piece of chocolate cake rated at 700 (food) Calories. How high must the person climb?
1) You accidentally let an empty iron skillet get very hot on the stove (200°C). When you dunk it into a couple of inches of water (about the same mass as the skillet), the temperature of the water
____ a) rises by about 10 to 20 degrees.
____ b) rises to boiling point.
____ c) rises to 200°C.
____ d) remains the same as before.
Note: Specific heat of iron is less than that of water.
____ a) is less dense.
____ b) strikes the skin with greater force.
____ c) has a higher specific heat capacity.
____ d) contains more internal energy.
____ a) the water to boil away faster.
____ b) the temperature of the boiling water to increase.
____ c) both the water to boil away faster and the temperature of the boiling water to increase.
____ d) none of the above.
____ a) the pressure forces heat into the food.
____ b) the higher pressure lowers the boiling point of water.
____ c) the higher pressure raises the boiling point of water.
____ d) the higher pressure increases the specific heat capacity of water.
1) How much heat must be removed from 1.4 kg of aluminum in order to cool it from 80°C to 15°C?
2) If 0.20 kg of coffee at 90°C is poured into a 0.30 kg cup at 20°C, and we assume that no heat is transferred to or from the outside, what is the final temperature of the coffee?
3) What is the heat needed to raise the temperature of the water from 60°C to its boiling point of 100°C?
1) An object with a black surface usually heats up more than one with a white surface when both are in sunlight. Such is true of the robes worn by Bedouins in the Sinai desert: black robes heat up more than white robes. Why then would a Bedouin ever wear a black robe?
4) How does perspiration give the body a means of cooling itself?
5) How does the thermos bottle (consists of two glass vessel, each coated with a thin film of silver, one inside the other with the space between them evacuated) work? Can we use this for cold, as well as hot, drinks?
____ a) The hot air around the heater rises and the cooler air moves in to take its place.
____ b) The hot air around the heater drops and the cooler air moves in to take its place.
____ c) The convection currents move about the cabin in a random fashion.
____ d) There are no convection currents.
1) A major source of heat loss from a house is by conduction loss through the windows. Calculate the rate of heat flow through a glass window 2.0 m x 1.5 m in area and 3.2 mm thick, if the temperatures at the inner and outer surfaces are 15.0°C and 14.0°C, respectively. The thermal conductivity of glass k is 0.84 J/s·m·C°.