Physics Test 3

Gravity

6.67 x 10^-11 N·m2/kg2

The metal in a chunk of copper or iron is composed of A. crystals. B. non-crystalline fibers. C. amorphous particles. D. none of the above

A. crystals

The best time for digging clams (when the low tide is extra low) is during the time of the A. new or full moon. B. half moon. C. quarter moon. D. none of these times in particular

A. new or full moon

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is A. very weak. B. strong. C. very strong.

A. very weak

Normal atomic matter makes up what percentage of the universe? a. almost 0 % b. almost 5% c. almost 28% d. almost 67% e. nearly 100%

About 5%

A fundamental difference between gases and liquids is that a. gases are easily compressed b. the density of liquids is not depth dependent c. gases expand to fill their container d. all of the above e. none of the above

All of the above

If a battleship sinks in a canal lock, the water level in the lock will A. rise. B. fall. C. remain unchanged.

B. fall

Compared to a 50 -kg person, a 100-kg person at the beach requires A. more than twice as much suntan lotion. B. the same amount of suntan lotion. C. less than twice as much suntan lotion.

B. the same amount of suntan lotion

You experience weightlessness A.in the absence of a supporting surface. B. momentarily when you step o a chair. C. in a freely falling elevator. D. all of the above

D. all of the above

A dam is thicker at the bottom than at the top partly because A. it looks better. B. water is denser at deeper levels. C. surface tension exists only on the surface of liquids. D. water pressure is greater with increasing depth. E. none of these

D. water pressure is greater with increasing depth

Force of gravity equation

F = Gm1m2/d2

A proton is A. 2000 times more massive than an electron B. 2000 times less massive than a neutron. C. about the same mass as an electron. D. B) and C). E. none of the above.

a. 2000 times more massive than an electron

Which of these investigators did NOT contribute to our knowledge of atoms? A. Aristotle B. John Dalton C. Robert Brown D. Albert Einstein

a. Aristotle

The element of gold contains A. gold atoms. B. atoms that combine to produce gold. C. gold atoms plus various slightly lighter and heavier atoms. D. none of the above

a. gold atoms

When a boat sails from fresh water to salt water, the boat will float A. higher in the water. B. lower in the water. C. at the same water level.

a. higher in the water

Compared to the volume of a kilogram of feathers, the volume of a kilogram of lead is A. less. B. more. C. the same.

a. less

The best time for digging clams (when the low tide is extra low) is during the time of the a. new or full moon b. half moon c. quarter moon d. none of these times in particular

a. new or full moon

Which is most responsible for the ocean tides? A. the moon B. the sun C. Both contribute equally.

a. the moon

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is a. very weak b. strong c. very strong

a. very weak

At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about a. 1 kg b. 1.25 kg c. 2 kg d. 2.25 kg

b. 1.25 kg

At normal atmospheric pressure and temperature, 1 cubic meter of air has a mass of about A. 1.00 kg. B. 1.25 kg. C. 2.00 kg. D. 2.25 kg.

b. 1.25 kg

A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of a. 2.5 g/cc b. 5 g/cc c. 10 g/cc

b. 5 g/cm^3 same material same density

The weight of a 1 -centimeter cubed metal cube scaled up by a factor of 10 will be a. ten times as much b. a hundred times as much c. a thousand times as much d. none of the above

b. a hundred times as much

Normal atomic matter makes up what percentage of the universe? A. almost 0% B. almost 5% C. almost 28% D. almost 67% E. nearly 100%

b. almost 5%

As a helium-filled balloon rises in the air, it becomes a. heavier b. bigger c. more dense d. all of these e. none of these

b. bigger

When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam undergoes A. tension. B. compression. C. either of these D. none of these

b. compression

The chemical properties of matter come mostly from a. protons b. electrons c. neutrons

b. electrons

The chemical properties of matter come mostly from its A. protons. B. electrons. C. neutrons.

b. electrons

If a battleship sinks in a canal lock, the water level in the lock will a. rise b. fall c. remain unchanged

b. fall

A mouseʹs heartbeat is faster and blood flow greater relative to its body weight compared to an elephantʹs because the mouse has a. a constant fear of being caught by a cat b. larger heat radiating area compared to its volume c. a coat of fur d. smaller heat radiating area compared to its volume

b. larger heat radiating area compared to its volume

Atoms heavier than hydrogen were made by a. photosynthesis b. nuclear fusion c. radiant energy conversion d. radioactivity e. none of these

b. nuclear fusion

Atoms heavier than hydrogen were made by A. photosynthesis. B. nuclear fusion. C. radiant energy conversion. D. radioactivity. E. none of these

b. nuclear fusion

Two life preservers have identical volumes, one filled with Styrofoam and the other filled with sand. When the two life preservers are worn by swimmers, one swimmer floats with part of the preserver above water and the other swimmer sinks. In this case, the buoyant force is greater on the life preserver filled with A. Styrofoam. B. sand. C. same for both

b. sand

A fundamental difference between gases and liquids is that A. liquids are easily compressed. B. the density of gases is greater at greater depths. C. gas molecules move freely around each other. D. liquids flow. E. none of the above

b. the density of gases is greater at greater depths

Which produces a greater tidal effect in your body, the moon, the sun, or a 1 -kg melon held above your head? A. the moon B. the melon C. the sun D. Not enough information is given to make a reasonable estimate.

b. the melon

Which pulls on the oceans of the Earth with the greater force? a. the moon b. the sun c. both pull the same

b. the sun (but the moon produces bigger tides)

How many different kinds of elements are in a water molecule? a. one b. two c. three d. four e. none

b. two total atoms: 3 2 different kinds of elements

Airplane flight best illustrates A. Archimedesʹ principle. B. Pascalʹs principle. C. Bernoulliʹs principle. D. Boyleʹs law.

c. Bernoulli's principle

Atmospheric molecules do not fly o into outer space because of a. their relatively high speeds b. their relatively low densities c. earth gravitation d. cohesive forces

c. Earth's gravitation

The planet Jupiter is about 300 times as massive as Earth, yet on its surface, you would weigh only about 3 times as much. This is because a. your mass is 100 times less on Jupiter b. Jupiter is significantly farther from the sun c. Jupiter's radius is 10 times the Earth's radius d. you are 100 times more weightless there e. none of these

c. Jupiter's radius is 10 times the Earth's radius

The weight of a 1 -centimer cubed metal cube scaled up by a factor of 10 will be A. ten times as much. B. a hundred times as much. C. a thousand times as much. D. none of the above

c. a thousand times as much

An umbrella tends to move upwards on a windy day principally because a. air gets trapped under the umbrella, warms, and rises b. buoyancy increases with increasing wind speed c. air pressure is reduced over the curved top surface d. all of these

c. air pressure is reduced on the top

An umbrella tends to move upwards on a windy day principally because A. air gets trapped under the umbrella, warms, and rises. B. buoyancy increases with increasing wind speed. C. air pressure is reduced over the curved top surface. D. all of these

c. air pressure is reduced over the curved top surface

Atmospheric molecules do not fly o into outer space because of A. their relatively high speeds. B. their relatively low densities. C. Earth gravitation. D. cohesive forces.

c. earth gravitation

Consider two planets in space that gravitationally attract each other. If the masses of both planets are quadrupled, and the distance between them is doubled, then the force between them is A. eight times as much. B. half as much. C. four times as much. D. twice as much. E. the same.

c. four times as much

The reason the moon does not crash into the Earth is that the A. Earthʹs gravitational field is weak at the moon. B. gravitational pull off other planets keeps the moon up. C. moon has sufficient tangential speed. D. moon has less mass than the Earth. E. none of these

c. moon has a sufficient tangential speed

Atomic mass number refers to the number of a. protons in the nucleus b. neutrons in the nucleus c. nucleons in the nucleus

c. nucleons in the nucleus

Atomic mass number refers to the number of A. protons in the nucleus. B. neutrons in the nucleus. C. nucleons in the nucleus.

c. nucleons in the nucleus

A completely submerged object always displaces its own a. weight of fluid b. density of fluid c. volume of fluid d. all of these e. none of these

c. volume fluid

A completely submerged object always displaces its own A. weight of fluid. B. density of fluid. C. volume of fluid. D. all of these E. none of these

c. volume of fluid

The metal in a chunk of copper or iron is composed of a. crystals b. non-crystalline fibers c. amorphous particles d. none of the above

crystals

A metal block has a mass of 40 grams and a volume of 8 cubic centimeters. A block of another kind of metal with a volume of 6 cubic centimeters is twice as dense as the first block. The mass of the second block is A. 5 grams. B. 10 grams. C. 30 grams. D. 60 grams. E. 80 grams.

d. 60 grams

An unstretched hanging spring is 50 cm long. Suspending a 100 -N weight from it makes its length 60 cm. Adding an additional 200 -N weight will make the springʹs length a. 180 cm b. 100 cm c. 70 cm d. 80 cm e. 60 cm

d. 80 cm

An unstretched hanging spring is 50 cm long. Suspending a 100 -N weight from it makes its length 60 cm. Adding an additional 200 -N weight will make the springʹs length A. 180 cm. B. 100 cm. C. 70 cm. D. 80 cm. E. 60 cm.

d. 80 cm

You experience weightlessness a. in the absence of a supporting surface b. momentarily when you step off a chair c. in a freely falling elevator d. all of the above

d. all of the above in the absence of a supporting surface, momentarily when you step off of a chair, in a freely falling elevator.

A dam is thicker at the bottom than at the top partly because a. it looks better b. water is denser at deeper levels c. surface tension exists only on the surface of liquids d. water pressure is greater with increasing depth e. none of these

d. water pressure is greater with increasing depth

As a balloon rises higher and higher into the atmosphere, its A. volume decreases. B. density increases. C. weight increases. D. mass decreases. E. none of these

e. none of these

The volume of water displaced by a floating 20 -ton steel boat a. is 20 cubic meters b. is the volume of 20 tons of steel c. is the volume of the boat d. depends on the shape of the ship's hull e. none of these

e. none of these

The volume of water displaced by a floating 20 -ton steel boat A. is 20 cubic meters B. is the volume of 20 tons of steel. C. is the volume of the boat. D. depends on the shape of the shipʹs hull. E. none of these

e. none of these

Pressure

force/area

Force

k (spring constants) *x (amount of stretch or compression)

Density

mass/volume

Two life preservers have identical volumes, but one is filled with styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with a. styrofoam b. sand c. same on each as long as their volumes are the same

same as long as their volumes are the same