Physics 3

What is the approximate mass of a 1-square-centimeter column of air that extends from sea level to the top of the atmosphere?

1 kilogram

A balloon is buoyed up with a force equal to the

All of these choices are correct.

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has

a low specific heat.

A good heat conductor is

a poor insulator.

A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of mercury in it, the height of the mercury column would be

about 3/4 meter.

Objects that radiate relatively well

absorb radiation relatively well.

An umbrella tends to move upwards on a windy day principally because

air pressure is reduced over the curved top surface.

Substances absorb heat energy by the process of

all of these.

Pour a liter of water at 40 degrees C into a liter of water at 20 degrees C and the final temperature of the two becomes

at or about 30 degrees C.

In drinking soda or water through a straw, we make use of

atmospheric pressure.

A bubble of air released from the bottom of a lake

becomes larger as it rises.

As a helium-filled balloon rises in the air, it becomes

bigger.

A liter of 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 a solid object radiates more energy than it absorbs, its

both internal energy and temperature decrease.

Wind blowing over the top of a hill

decreases atmospheric pressure there.

An empty jar is pushed open-side downward into water so that air trapped in it cannot get out. As it is pushed deeper, the buoyant force on the jar

decreases.

Suppose you are 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

doubles

When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure

doubles

When gas in a container is squeezed to half its volume, its density

doubles.

When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it

expands

When you touch a cold piece of ice with your finger, energy flows

from your finger to the ice.

As a woman holding her breath swims deeper and deeper beneath the water's surface, her density

increases.

When a volume of air is compressed, its temperature

increases.

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

iron

Your feet feel warmer on a rug than on a tile floor because a rug

is a better insulator than tile.

Ice has a lower density than water because ice

is made of open-structured, hexagonal crystals.

When an iron ring is heated, the hole becomes

larger

If you measure the area of a plot of land with a steel tape on a very hot day, the actual amount of land you will have will be

larger than measured.

Microscopic slush in cold water tends to make the water density

less

The faster a fluid moves, the

less its internal pressure.

Place a kilogram block of iron at 40 degrees C into a kilogram of water at 20 degrees C and the final temperature of the two becomes

less than 30 degrees C.

Double the absolute temperature of helium gas and the average speed of its molecules

less than doubles.

Metals are both good heat conductors and good electrical conductors because of the

looseness of outer electrons in metal atoms.

A substance that heats up relatively quickly has a

low specific heat.

One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with

low thermal conductivity of the coals.

Alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal, the height of the alcohol column would be

more than 10.3 m.

About what percentage of the molecules that make up the atmosphere are below an aircraft that flies at an altitude of 6 kilometers?

more than 50%

A car with closed windows makes a left hand turn. A helium-filled balloon in the car will

move to the left.

A one-ton blimp hovers in the air. The buoyant force acting on it is

one ton.

If a strong wind from the west breaks a window in the north wall of a house, most of the glass will fall

outside the house.

A good reflector of radiation is a

poor absorber of radiation.

A suction cup sticks to a wall. It is

pushed to the wall by the atmosphere.

A Thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by

radiation.

The planet Earth loses heat mainly by

radiation.

Double the absolute temperature of helium gas and the average kinetic energy of its molecules

right away.

Can a sample of water possibly have the same volume after being warmed by several Celsius degrees?

sometimes

Which of the following bodies is comprised mostly of plasma?

sun

It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

supports this common knowledge.

Ice tends to form first at the

surface of bodies of water.

Heat energy travels from an object with a higher

temperature to an object with a lower temperature.

A helium-filled balloon released in the atmosphere will rise until

the balloon and surrounding air have equal densities.

Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be

the black surface.

The white-hot sparks that strike your skin from a 4th-of-July-type sparkler don't harm you because

the energy per molecule is high, but little energy is transferred because of the few molecules in the spark.

Which of the following is an example of matter in a plasma state?

the inside of a flourescent light

The flight of a blimp best illustrates

the principle of Archimedes.

Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise

the same height as in the larger tube.

Compared to the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is

the same.

The higher the temperature of an object

the shorter the wavelengths it radiates.

Both black and white road surfaces radiate energy. At the end of a starry night the warmer road surface will be

the white surface.

Suspend a pair of Ping-Pong balls from two strings so there is a small space between them. If you blow air between the balls, they will swing

toward each other.

Consider a closed, sealed can of air placed on a hot stove. The contained air undergoes an increase in

two of these.

It would be easier to pull evacuated Magdeburg hemispheres apart when they are

20 km above the ocean surface.

Room temperature on the Kelvin scale is about

300 K.

About how high can water be theoretically lifted by a vacuum pump at sea level?

10.3 m

A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of water in it, the height of the water column would be

10.3 m.

The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is

10.3 m.

The weight of a 1-square-meter column of air that extends from sea level to the top of the atmosphere is

101,000 N.

Airplane flight best illustrates

Bernoulli's principle.

Heat energy is measured in units of

Either joules or calories.

A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the

Kelvin scale.

Newton's law of cooling applies to objects that are

both of these.

Which body glows with electromagnetic waves?

both the Sun and the Earth

In a vacuum, an object has no

buoyant force.

Compared to the buoyant force of the atmosphere on a 1-kilogram helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-kilogram solid iron block is

considerably less.

If a volume of air is warmed, it expands. If a volume of air expands, it

cools.

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron.

Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be

copper.

Consider a sample of ice at 0 degrees C. If the temperature is decreased, the volume of the ice

decreases

If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature

decreases

A good absorber of radiation is a

good emitter of radiation.

The reason the Sun's radiant energy is of shorter wavelengths than the Earth's is because the Sun

has a higher temperature than the Earth.

The moderate temperatures of islands throughout the world has much to do with water's

high specific heat.

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

higher temperature, but less internal energy.

An object will normally be a net radiator of energy when its temperature is

higher than its surroundings.

In a mixture of hydrogen gas and oxygen gas, the molecules with the greatest average speed are those of

hydrogen.

Suppose you are standing on a weighing scale and all of a sudden the atmosphere vanished. The reading on the scale would

increase

When ice floats in water, a small part of it extends above the surface. Interestingly enough, the volume of ice that extends above the surface is equal to the volume of the

vast number of open spaces in the hexagonal ice crystals.

At the same temperature, which move with the greater speed in the air?

very light molecules

As a high-altitude balloon sinks lower and lower into the atmosphere, it undergoes a decrease in

volume

Which of the following contracts when the temperature is increased? Equal volumes of

water at 0 degrees Celsius.

Which of the following expands when the temperature is lowered? Equal volumes of

water at 4 degrees C.

During a very cold winter, water pipes sometimes burst. The reason for this is

water expands when freezing.

Atmospheric pressure is caused by the

weight of the atmosphere.

Two vertical tubes of equal cross-sectional areas are filled with water and mercury. If water is filled to a depth of 10.3 m and mercury to a depth of 0.76 m, both liquids have equal

weights

A large block of wood and a smaller block of iron on weighing scales both register the same weight - 1 ton. Taking buoyancy of air into account, which has the greater mass?

wood