Bernoulli’s principle says |
whenever the fluid, the speed of a fluid increases, its internal pressure decreases |
An ideal gas is confined to a container with an adjustable volume. If the pressure and mole number are both maintained constant, by what factor will the volume change when the absolute temperature is doubled? |
2 |
The temperature of an ideal gas increase from 3C to 6C while remaining at constant pressure. What happens to the volume of the gas? |
It increases slightly |
If the pressure acting on an ideal gas at constant temperature is doubled, its volume is |
Reduced to one-half |
If the pressure acting on an ideal gas at constant temperature is tripled, its volume is |
Reduced to one-third |
Which one of the following statements best explains why gases are not commercially sold by volume? |
Gas volume depends on temperature and pressure |
A sample of neon gas at 30 degrees Celsius is confined to a cylinder with a movable piston. It is then heated until its pressure is doubled. What is the final temperature of the gas? |
This cannot be found since the final and initial volumes are unknown. |
A sample of a monatomic ideal gas is originally at 27 degrees Celsius. What is the final temperature of the gas if both the pressure and volume are doubled? |
4(27+273) |
An ideal gas at 0 °C is contained within a rigid vessel. The temperature of the gas is increased by 2 C°. What is Pf/Pi, the ratio of the final to initial pressure? |
275/273 |
Which one of the following properties of a gas is not consistent with the ideal gas? |
The average speed of the molecules is smaller at high temperatures |
Which one of the following factors is directly responsible for the pressure exerted by a confined gas? |
Collision of gas molecules with the sides of the containing vessel |
A copper rod has one of its ends placed in a Bunsen flame and the other end embedded in an ice cube. By what factor is the rate of heat flow changed when the rod length is tripled? |
0.33 |
If holding hands to one side of a flame, the predominant form of heat transfer is what process? |
radiation |
The primary reason why a sandy beach gets so hot on a sunny day is because |
sand has a small specific heat |
The space between the inner walls of a thermos bottle is evacuated to minimize heat transfer by |
conduction and convection |
If your hands are being warmed by holding them above a flame, then the primary form of heat transfer is which? |
convection |
Sea breezes on a beach are attributed to a difference between land and water with respect to what property? |
specific heat |
If you triple the absolute temperature of an object, it will radiate energy |
81 times faster |
Convection can occur |
only in liquids and gases |
By what primary heat transfer mechanism does the sun warm the earth |
radiation |
By what primary heat transfer mechanism does one end of a metal spoon become hot when the other end is placed in a boiling water? |
conduction |
When a vapor condenses |
heat energy leaves the substance |
Saturation occurs in air when the |
air contains as many water molecules as it can contain at a given temperature |
When water freezes, the entropy of the water |
decreases |
Is it possible to transfer heat from a cold reservoir to a hot reservoir? |
yes, but work will have to be done |
The second law of thermodynamics leads us to conclude that |
disorder in the universe is increasing with the passage of time |
What is the theoretical efficiency of a Carnot engine that operates between 600 and 300 kelvin? |
50% |
A substance can absorb heat energy by the process of |
all of the above |
Metals are both good heat conductors and also good electrical conductors because of the |
looseness of outer electrons in metal atoms |
A good heat conductor is a |
poor insulator |
Your feet feel warmer on a rug than on a tile floor because the rug |
is a better insulator than tile |
Energy transfer by convection is primarily restricted to |
fluids |
Warm air rises because faster moving molecules tend to move to regions of less |
density and pressure (both of these) |
Objects that radiate relatively well |
absorb radiation relatively well |
Hot water will cool to room temperature faster in a |
black pot |
Cold water will warm to room temperature faster in a |
black pot |
If air were a better conductor that it is, at nighttime the earth would be |
considerably colder |
A water-filled paper cup held in a flame will not catch fire. This is because |
the paper cup cannot become appreciably hotter than the water it contains |
An object will normally be a net radiator of energy when its thermal energy is |
can’t say, because thermal energy is not a temperature |
The silver coating on the glass surfaces of Thermos bottle reduces energy that is transferred |
radiation |
If a volume of air is warmed, it expands. If a volume of air expands, it |
warms |
When a volume of air is compressed, its temperature |
decreases |
If a poor absorber of radiation were a good emitter, its temperature would be |
less than its surroundings |
A good absorber of radiation is |
a good emitter of radiation |
A good reflector of radiation is |
a poor absorber of radiation |
If you were caught in freezing weather with only a candle for heat, you would be warmer in |
an igloo |
If molecules in a sample gas moved so they completely missed each other the gas’s temperature |
would stay the same |
Hydrogen and oxygen molecule in a sample gas have the same temperature. This means the hydrogen molecules, on average, have the same |
kinetic energy, but more speed |
Suppose you served coffee at a restaurant before you are ready to drink it. In order for it to be the hottest when you are ready for it, you should add cream |
right away |
The planet Earth loses heat mainly by |
radiation |
Double the absolute temperature of helium gas, and the molecules of helium, on average speed up, |
less than twice |
Evaporation is a cooling process because |
the more energetic molecules are able to escape the liquid |
Steam bums are more damaging than burns caused by boiling water because steam |
both of these, gives up additional energy and has more energy per kilogram |
We are warmed by condensation because water molecules in the air that strike our bodies |
transfer some of their kinetic energies to us |
When heat is added to boiling water, the water temperature |
stays the same |
Increased air pressure on the surface of hot water tends to |
prevent boiling |
In the mountains, water boils at |
a lower temperature than at sea level |
Compared to a glass oc ice water with ice in it, a glass of plain ice-cold water without ice on a warm day will warm up |
faster |
When bringing water to a boil in the mountains, the time needed to reach the boiling point is |
less than at sea level |
Food in a pressure cooker is cooked faster because of the |
higher temperature |
Food cooked in boiling water in the mountains cooks slower than when cooked at sea level. If the temperature under the pot is increase, the food will cook |
neither |
If you want to cook eggs by boiling them while in the mountains, then compared to sea level cooking, you should |
boil the eggs for a longer time |
An inventor discovers a harmless and tasteless salt, which, when added to water changes its boiling point. The market value for this salt will be best if the salt |
raises the boiling point of water |
Consider a steaming aluminum soda-pop can that contains a small amount of boiling water. When it is quickly inserted into a bath of cooler water, the can is dramatically crushed by atmospheric pressure. This occurs because the pressure inside the can is rapidly reduced by |
condensation of steam inside |
When a gas is changed to a liquid phase, the gas |
releases energy |
When a solid is changed to a liquid phase, the solid |
absorbs energy |
When liquids change to a solid phase, they |
release energy |
Which would bum the must |
100g of steam at 100 degrees Celsius |
Suppose you walk on red coals with bare feet. Providing bits of coal do no stick to your feet, it would be best if your feet are |
wet |
Te melt 50 g of 0 degree Celsius ice requires |
4000 calories |
To turn 50 g of boiling water to steam requires |
27,000 calories |
A refrigerator |
removes thermal energy from inside the refrigerator |
The cooling effect inside a refrigerator is produced by |
vaporizing the refrigeration liquid |
Ice is put in a cooler in order to cool the contents. To speed up the cooling process, the ice can be |
crushed |
which involves the larger number of calories? |
the condensation of 1 g of steam at 100 degrees Celsius to 100 degree Celsius water |
The number of grams of ice that can be melted by 1 gram of 100 degree Celsius steam is |
8 g |
physics ch. 8
Share This
Unfinished tasks keep piling up?
Let us complete them for you. Quickly and professionally.
Check Price