Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Physics Review
| Question | Answer |
|---|---|
| "Smart rocks" are considered for: | Ballistic missile defense |
| One watt is equivalent to: | One joule/second |
| The asteroid that killed the dinosaurs exploded because: | It got very hot from the impact |
| Kinetic Energy can be measured in: | Watts |
| Which of the following statements is true? | Power is energy divided by time |
| For each of these, mark whether it is a unit of energy (E) or power (P): A. Horsepower B. Kilowatt-hour C. Watt D. Calorie | Horsepower: P Kilowatt-hour: E Watt: P Calorie: E |
| Hybrid vehicles run on: | Electric power and gasoline |
| What is the main reason that hydrogen-driven automobiles have not replaced gasoline ones? | Hydrogen is too difficult to store in an automobil |
| Compared to an equal weight of gasoline, U-235 can deliver energy that is greater by a factor of (choose the closest value): | One million |
| Which of the following contains the most energy per gram? | Uranium |
| Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries: | The gasoline has about 70 times MORE energy |
| What is least expensive-for the same energy delivered? | Coal |
| The kinetic energy of a typical 1-gram meteor is approximately equal to the energy of: | 150 grams of TNT |
| Coal reserves in the United States are expected to last for: | Hundreds of years |
| A limitation for all electric automobiles is: | Low energy density per battery |
| Solar power is about (choose all that are correct): | 1 kW per square meter |
| The efficiency of inexpensive solar cells is closest to: | 12% |
| A human, running up stairs, can briefly use power of approximately: | 1 horsepower |
| A 12-oz can of soft drink (not the "diet" or "lite" kind) contains about: | 150 calories |
| A large nuclear power plant delivers energy of about: | 1 gigawatt |
| Electricity from a AAA battery costs the consumer about: | $1000 per kilowatt-hour |
| Electricity from a wall plug costs the consumer about: | 10 cents per kWh |
| The energy per gallon (not per pound) of liquid hydrogen compared to gasoline, is about: | 3x less |
| Most of the hydrogen we use in the United States comes from: | It is manufactured from fossil fuels and/or water |
| You have 10 tungsten bulbs, and each uses 100 watts. You leave them all on for an hour. The energy used is: | 1 kWh |
| The kinetic energy of a bullet, per gram, is (within a factor of 2): | About the same as the energy released from 1 gram of TNT |
| If you double the energy content of a kilogram of gas, the temperature of the gas (measured on the absolute K scale): | Doubles |
| About how fast are molecules in air moving? | 1000 ft/sec |
| Temperature is the measure of: | Average kinetic energy |
| In a bucket of water, the instantaneous speed of the molecules is closest to: | Approximately 1000 ft/s |
| A refrigerator operating in a room: | Warms the room |
| A refrigerator with its door open is operating in a room. It: | Warms the room |
| A table has the same temperature as the air above it. That means that the molecules in the air and in the tables have: | The same average energy |
| Ice melts at: | 0 C |
| A gas heater warms a room mostly through: | Convection |
| The velocity of sound: | Increases when the temperature increases |
| If a gasoline engine produces a hotter explosion, then the efficiency of the engine should: | Go up |
| A cup full of water and made of plastic feels warmer then one made of glass because: | Plastic conducts heat less than glass |
| The atom with the fewest number of protons is: | Hydrogen |
| How many atoms are there in the width of a human hair? About: | 125,000 |
| The speed of sound is approximately: | 1000 feet per second |
| Put a hot glass in cool water. The glass shatters because: | The outer surface of the glass contracts rapidly, but the inner part doesn't |
| Sea level is rising from global warming. The main cause is: | Expanding sea water |
| The temperature warms by 2 C. That is approximately the same as: | 4 F |
| Heat a room using the least energy by: | Using natural gas to run a heat pump |
| There is almost no hydrogen gas in the atmosphere because: | It escapes Earth's gravity |
| At March 10, if all the energy of a meteorite went into heating the meteorite, it's temperature would be about: | 30,000 C |
| The New Orleans levees failed because: | They were weaker at the thermal expansion joints |
| If temperature rises by 5 C = 9 F, then the rise in sea level will be about: | 12 feet |
| For a typical auto, the fraction of the gasoline energy wasted as heat is about (careful, this may be a trick question): | 80% |
| The temperature in the sun: | Is not well defined |
| When a material is cooled: | some materials contract and some expand |
| The melting temperature of an object is usually: | equal to its freezing point |
| Absolute zero is the temperature of | nothing |
| When a liquid boils, the increase in volume (liquid to gas) is typically a factor of | 1,000 |
| If the temperature of a gas in a container goes from 0 C to 300 C the pressure will | becomes 300 times greater |
| Firewalking is similar to | water on saucepan |
| For gasoline to explode, it needs | to be mixed with oxygen |
| To be more efficient, the temperature difference (between the ignited hot fuel and the cool part of the engine) should be | as large as possible |
| Heat flow through empty space (no atoms present) | occurs through radiation |
| Entropy (optical topic) measures | disorder |
| Molecular motion stops at | 0K |
| At high velocities, most of the fuel used in an automobile is used to overcome | air resistance |
| Balloons rise until | the surrounding air becomes too dense |
| At an altitude of 200 km, the downward force of gravity on an Earth satellite is | a little bit weaker |
| Airplanes fly (maintain their altitude) by | pushing air downward |
| Rockets fly by | pushing fuel donward |
| The storm surge in a hurricane comes from | low pressure |
| When an astronaut in space sneezes, his head is snapped back with higher velocity than on Earth, because | wrong! his head is not snapped back with higher velocity |
| A rail gun | doesn't really accelerate things |
| The Sun would be a black hole if it were squeezed into a radius of | 2 miles |
| The method that would take the least energy to get something to space is | lifting it by elevator (if elevator existed) |
| If an artificial satellite orbited the Earth at 240,000 miles (the distance to the Moon), it would orbit the Earth in a period of | 1 month |
| The time it takes a geosynchronous satellite to orbit the Earth is | 1 day |
| The force of gravity between two people standing next to each other is | small but mesurable |
| You can see where the tropopause is by | looking at the tops of thunderstorms |
| If satellites fly too low, they will crash because | of stronger gravity |
| Ice-skaters spin faster by pulling in their arms. This illustrates that | angular momentum is conserved |
| Someone firing a rifle is pushed back by the rifle. This illustrates that | momentum is covered |
| A problem with rail guns is that | the high accelerations can cause damage |
| The maximum acceleration of the space shuttle is about | 3 g's |
| The lowest practical altitude for a satellite orbiting the Earth is about | 600 miles |
| For very high velocities, the best kind of rocket to use is | ion rocket |
| The altitude of a geosynchronous satellite is closest to | 22,000 miles |
| Skyhook, if built, is | a way to get into space using less enegy |
| If you fall for one second, your speed will be approximately | 22 mph |
| Artificial gravity can be created in a spaceship by | accelerating the ship |
| Orbital velocity is about | 5 miles per second |
| The Sun is mostly hydrogen, yet the Earth has very little hydrogen gas. That's because | it escaped to space |
| The orbit of GPS is | MEO (middle earth orbit) |
| A geosynchronous satellite orbits the Earth | once every 24 hours |
| A typical spy satellite can continuously observe a location on the ground for about | one minute |
| Compared to the weight of the payload, the fuel used in a rocket to orbit typically weighs | over 20 times more |
| *A cubic meter balloon can lift | about one gram |
| Spy satellites usually fly at | Leo |
| Energy in the Sun is produced primarily by | fusion |
| The mass of the nucleus is closest to | 99% of that in the entire atom |
| Radioactivity in the Earth leads to | energy for volcanoes, helium for toy balloons, heat for geysers |
| LD50 refers to a | lethal dose |
| A major reason that your body is not radioactive is that | you eat radioactive carbon in your food |
| The primary cause of death from the Hiroshima bomb was | the blast from the bomb |
| Fission fragments are | among the most dangerous kind of radiation |
| **Wine made from fossil fuels is not radioactive because | the radioactivity has decayed away |
| If the half-life of an element is big, that means that | it decays slower than one with a small half-life |
| Muller wears a wristwatch with tritium in the watch hands because | the levels of radiation that emerge are safe |
| After three half-lives, the fraction of nuclei remaining is | 1/8 |
| Most of the elements found on the Earth were created | in the first few million years of the Earth's existence |
| The fraction of the US population that dies from cancer is typically | about 1 in 5 |
| Watch dials containing radium glow because | the radiation hits a phosphor |
| Choose all the items that derive from radioactivity | helium for children's balloons volcanic lava |
| After four half-lives, the surviving tritium atoms are removed. Compared to completely new tritium atoms, they are expected to live | exactly as long |
| One rem of radiation does takes how many gammas per square centimeter | about 2 billion |
| Which requires the larger dose | cancer |
| The linear hypothesis is | widely used even though it is not proven |
| A Sievert is how many rem | 100 |
| Cancer is lower in Denver because | we don't know why |
| The number of deaths from the Chernobyl accident is about | 24,000 |
| Radioactivity is used in | smoke detectors |
| Neutron activation is used | to search for rare atoms |
| Dirty bombs may be less of a threat than people fear, because | dirty bombs require plutonium, and that is hard for terrorists to obtain |
| Radioactivity in the Earth is responsible for | helium we use in balloons |
| Volcanic heat comes from | fusion deep in the Earth |
| The best way to measure the age of an ancient bone is | radiocarbon dating |
| An RTG (radioisotope thermoelectric generator) is | carried in satellites for power |
| Uranium is found on Earth, even though it is radioactive. That's because | it has a very long half-life |
| Carbon-14, compared to carbon-12 | has more protons |
| Alexander Litvinenko was assassinated with | plutonium |
| The radiation from cell phones | does not cause cancer |
| The threshold for radiation illness is about | 100 rem |
| The natural radioactivity (rate of nuclear decays) in a typical human body is closest to | 4000 per second |
| The source of energy in the Sun is | fusion of hydrogen |
| Which of the following is most toxic per gram | Plutonium |
| The radioactivity from your own body | does cause cancer, but at a very low rate |
| Drinking alcohol is required to be radioactive because | it shows that the alcohol was "aged" |
| Recent reports discussing the population bomb | indicate that the explosion is slowing |
| A one-kiloton nuclear weapon, exploded at ground level would destroy | about 1 square kilometer of a city |
| For an atomic bomb, the number of doublings required is closest to | 80 |
| An implosion-type bomb is required for | a Pu-239 bomb |
| Moore's law relates to | computer chip capacity |
| Which of the following does not represent exponential growth | illness from anthrax |
| The statement that the Chernobyl accident will kill 24,000 people is based on | the linear hypothesis |
| A moderator is something that | slows neutrons |
| The dangerous radioactivity in fallout comes from | fission fragments |
| Fallout is much worse if the bomb | is exploded near the ground |
| A nuclear reactor cannot explode like a nuclear bomb because | the nuclear reactor depends on slow neutrons |
| According to the text, the least bad place to put nuclear waste is | underground |
| A breeder reactor is designed to produce | Plutonium |
| The number of nuclear weapons that the US had was closest to | 10,000 |
| PCR has been used to | identify children of Thomas Jefferson check the guilt of convicted murders identify victimes of 9/11 identify the fathers of children |
| The hiroshima bomb used | a gun design |
| If the water moderator is lost from a nuclear reactor, | the chain reaction will increase, causing a reactivity accident |
| The material that might be "reprocessed" from nuclear waste is | Pu-239 |
| Which of the following is not a good example of the doubling law | future population growth |
| The Canadian Candu reactors use | deuterium |
| Plutonium can explode with few generations that can uranium because | plutonium fission releases more neutrons. |
| In a nuclear power plant, the matieral that runs through the turbine is | steam |
| The number of deaths from the Nagaski bomb is estimated to be | 50,000 to 150,000 |
| The smallest container that could contain one critical mass of plutonium is | coffee mug |
| The bomb dropped on Hiroshima used as its fuel | Uranium |
| Saddam Hussein planned to enrich uranium using | Calutrons |
| A centrifuge enrichment plant takes an area of about | one large classroom |
| Pcr involves | DNA |
| One of the most dangerous radioactive matierals from fallout is | Sr-90 |
| The term China Symdrome refers to | meltdown of the nuclear fuel |
| Depleted uranium is a useful substance because | an artillery shell made from it is very penetrating |
| PCR was used to learn about | descendants of Sally Hemmings |
| Another name for the H bomb is | thermonuclear bomb |
| A nuclear explosion similar to the one produced by North Korea would destroy | the size of a college campus |
| Cold fusion | has been seen in laboratory experiments |
| At Three Mile Island | some of the uranium fuel melted |
| What distinguishes a breeder reactor from other reactors is that | it makes more fuel than it uses |
| Jupiter is not a star because | it isn't massive enough |
Created by:
bella_grace11
Popular Physics sets