Physics Chapters 12- 2 homeworks from here

Stone slabs are stronger under A) tension. B) compression. C) both tension and compression.

B

Which of these atoms has the most mass? A) hydrogen B) iron C) lead D) uranium E) All have the same mass.

D

Which of these atoms has the greatest amount of electrical charge in its nucleus? A) helium B) carbon C) iron D) gold E) uranium

E

Which of these atoms has the greatest number of electrons? A) helium B) carbon C) iron D) gold E) uranium

E

A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the block, so each spring supports half the weight of the block, then each spring will stretch A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of these

A

Assuming all the atoms exhaled by Julius Caesar in his last dying breath are still in the atmosphere, then we probably breathe one of those atoms with each A) single breath. B) day. C) month. D) ten years. E) It depends - some people still breathe a few of Caesar's atoms every day, while others wouldn't breathe one for an entire year.

A

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

Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is A) less. B) the same. C) greater.

A

Flatten a spherical meatball into a hamburger and you increase its A) surface area. B) volume. C) both of the above D) none of the above

A

If the volume of an object were to double while its mass stays the same, its density would A) halve. B) double. C) stay the same. D) become four times as great.

A

The weight of matter comes mostly from its A) protons. B) electrons. C) neutrons

A

What makes an element distinct? A) the number of protons B) the number of neutrons C) the number of electrons D) the total mass of all the particles E) none of these

A

When a load is placed on the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes A) tension. B) compression.

A

Which of the following is not a compound? A) air B) ammonia C) water D) salt E) All are compounds.

A

A candymaker is making taffy apples. If she buys 100 kg of small apples rather than 100 kg of large apples, she will need A) less taffy. B) more taffy. C) the same amount of taffy.

B

A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume? A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of these

B

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

An unstretched hanging spring is 50 cm long. Suspending a 100-N weight from it makes its length 60 cm. Adding another 100-N weight will make the spring's length A) 60 cm. B) 70 cm. C) 80 cm. D) 100 cm. E) 120 cm.

B

Compared to a bar of pure gold, the density of a pure gold ring is A) less. B) the same. C) slightly more. D) much more.

B

Doubling the linear size of an object multiplies its area by A) 2 and its volume by 4. B) 4 and its volume by 8. C) 8 and its volume by 16. D) none of these

B

If a gram of antimatter meets a kilogram of matter, the amount of mass to survive is A) 1 gram. B) 999 grams. C) 1 kilogram. D) 1.1 kilogram.

B

If an elephant grew to twice its height, the area of its ears would be about A) twice what it was. B) four times what it was. C) six times what it was. D) eight times what it was. E) none of these

B

If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about A) ten and its weight by ten also. B) one hundred, but its weight by one thousand. C) one thousand, and its weight by one hundred. D) none of these

B

If object A in your left hand and object B in your right hand both have the same weight density, then they A) may have quite unequal mass densities. B) have equal mass densities. C) are equal in weight.

B

If the mass of an object were to double while its volume remains the same, its density would A) halve. B) double. C) stay the same. D) become four times as great.

B

If two protons are removed from an oxygen nucleus, the result is A) nitrogen. B) carbon. C) helium. D) neon. E) positively charged oxygen.

B

In cold weather, your hands will be warmer if you wear A) gloves. B) mittens. C) Both will be the same.

B

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

B

The volume of matter comes mostly from its A) protons. B) electrons. C) neutrons

B

When a chocolate bar is cut in half, its density is A) halved. B) unchanged. C) doubled.

B

When a living cell doubles in diameter, the amount of its material to be nourished is multiplied by eight, but the amount of membrane through which to feed it is multiplied by A) 2. B) 4. C) 8. D) more than 8.

B

When carbon and oxygen atoms combine, energy is A) taken in by the reaction. B) given off by the reaction. C) not involved.

B

When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo A) tension. B) compression. C) expansion. D) change of phase.

B

Which cooks faster in boiling oil? A) a whole potato. B) a sliced potato. C) Both cook the same.

B

Which of the following are electrically neutral? A) proton B) neutron C) electron D) ion E) none of these

B

Which of the following statements is true? A) An atom is the smallest particle known to exist. B) There are only about 100 different kinds of atoms that combine to form all substances. C) There are thousands of different kinds of atoms that account for a wide variety of substances. D) A large atom can be photographed with the aid of an ordinary microscope. E) None of these statements are true.

B

Which potatoes when peeled produce the most peelings? A) 10 kg of large potatoes B) 10 kg of small potatoes C) They both produce the same amount.

B

A strong spring is stretched 10 cm by a suspended weight. If the weight is doubled, the spring will stretch A) no more. B) another 5 cm, making the total stretch 15 cm. C) another 10 cm, making the total stretch 20 cm. D) another 30 cm, making the total stretch 40 cm. E) more than another 30 cm.

C

A weightless spring is stretched 10 cm by a suspended 1-kg block. If two such springs are used to suspend the block, one spring above the other, to effectively provide one double- length spring, then the total stretch of the double-length spring will be A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of these

C

A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density? A) 100 kg per cubic meter B) 200 kg per cubic meter C) 500 kg per cubic meter D) 1000 kg per cubic meter E) none of these

C

Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are A) newer. B) actually older. C) the same age.

C

Compared to the mass of a hydrogen atom, the mass of an oxygen atom is A) 8 times as great. B) 12 times as great. C) 16 times as great. D) appreciably more than 16 times as great.

C

If a pair of helium nuclei are fused together, the result is A) helium isotope. B) lithium. C) beryllium. D) boron. E) carbon.

C

If a pencil's length and diameter are both multiplied by 10, then its volume is multiplied by A) 10. B) 100. C) 1000. D) 10,000. E) none of these

C

If two protons are added to an oxygen nucleus, the result is A) heavy oxygen. B) fluorine. C) neon. D) sodium. E) nitrogen.

C

If we doubled the magnifying power of the most powerful optical microscope in the world, we would A) be able to see individual atoms. B) be able to photograph individual atoms, even though we couldn't see them. C) still not be able to see or photograph an atom.

C

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of A) neutrons. B) quarks. C) orbital electrons. D) all of these E) none of these

C

Nuclei of atoms that make up a newborn baby were made in A) the mother's womb. B) the food the mother eats before giving birth. C) ancient stars. D) the Earth. E) none of these

C

Suppose all sized potatoes are selling at the same price per kilogram. If you peel them for mashing, you will get more potato for your money if you buy A) small potatoes. B) medium potatoes. C) large potatoes. D) makes no difference

C

Tripling the linear size of an object multiplies its area by A) 3 and its volume by 9. B) 9 and its volume by 18. C) 9 and its volume by 27. D) 27 and its volume by 81. E) none of these

C

Which has the greater density, a lake full of water or a cup full of lake water? A) the cup full of lake water B) the lake full of lake water C) Both have the same density. D) It is impossible to tell without knowing the size of the lake.

C

Which has the greatest number of protons in its nucleus? A) gold. B) mercury. C) lead. D) silver.

C

You wish to bolt a sign to a horizontal I-beam supporting a bridge. You will weaken the beam least if you drill the bolt-holes through the A) upper flange. B) lower flange. C) web. D) All these will have the same effect.

C

A metal block has a density of 5000 kg per cubic meter and a volume of 2 cubic meters. What is the block's mass? A) 1000 kg B) 2500 kg C) 5000 kg D) 10,000 kg E) none of these

D

A molecule has A) mass. B) structure. C) energy. D) all of these E) none of these

D

A positron orbiting an antiproton would make up an atom of A) positronium. B) unobtainium. C) anti-helium. D) anti-hydrogen. E) none of these

D

An atomic mass unit (amu) is 1/12 the mass of A) an electron. B) a proton. C) a hydrogen atom. D) a carbon atom. E) a uranium atom.

D

Brownian motion has to do with the A) size of atoms. B) atomic vibrations. C) first direct measurement of atomic motion. D) random motions of atoms and molecules. E) rhythmic movements of atoms in a liquid.

D

If an astronaut landed on a planet made of antimatter, there would be an explosion and A) the planet would annihilate. B) an amount of planet matter equal to that of the astronaut would annihilate. C) the astronaut would annihilate. D) the astronaut and an equal amount of the planet would both annihilate.

D

If an elephant grows to twice its normal height, its weight will be multiplied by about A) 2. B) 4. C) 6. D) 8. E) none of these

D

There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of A) a large auditorium. B) a large city. C) the United States. D) the whole world. E) none of these

D

What is the molecular mass of a water molecule? A) 10 amu B) 12 amu C) 15 amu D) 18 amu E) None of these. It depends on the temperature.

D

Compared to the energy it takes to separate oxygen and hydrogen from water, the amount of energy given off when they recombine is A) slightly more. B) slightly less. C) much more. D) much less. E) the same.

E

If one neutron is added to a helium nucleus, the result is A) hydrogen. B) boron. C) lithium. D) beryllium. E) helium.

E

The smallest particle of those listed below is A) a molecule. B) an atom. C) a proton. D) a neutron. E) a quark.

E

To change mercury into gold, a pair of protons must be A) removed from the mercury nucleus. B) added to the mercury nucleus. C) removed from the gold nucleus D) added to the gold nucleus. E) None of the above is true.

E