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iClicker Questions
| Question | Answer |
|---|---|
| Which of the following ISNT a unit of force Newton Joule Pound Kg-m/s^2 | Joule |
| Which of the following is NOT a unit of energy joule kilowatt-hour calorie foot-pound meters per second | meters per second |
| Which has the most energy per dollar at current prices? | Gasoline |
| You have 10 electric motors, and each uses 100 watts. You leave them all on for an hour. The energy used is | 1 kilowatt-hour |
| If you normally consume 2000 cal per day and you want to lose 1 pound per week by dieting alone, about what fraction of your normal consumption do you need to forego? | 20% |
| What system uses the most average power | rock concert in a stadium |
| Compare the energy in a kilogram of gasoline to that in a kilogram of flashlight batteries | The gasoline has about 70 times as much energy |
| Remember the BC donut. The energy in one BC donut is about 240 kcal, or about 1 MJ. The energy in one BC donut can heat | 240 kg of water by 1 degree C |
| The melting temp of an object is usally | equal to its freezing point |
| 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 |
| Remember the concept of absolute zero. We would say that molecular motion stops at | 0 K |
| A gas is cooled from room temperature to -123 C. In absolute degrees this means it drops from 300 K to 150 K. Assuming there is no phase transition in the gas and the pressure is held constant, the volume will | drop by half |
| A gas heater warms a room mostly through | convection |
| A refrigerator with its door closed is operating in a room. It: | warms the room |
| A refrigerator with its door open is operating in a room. It: | warms the room |
| At 250 miles above the surface of the earth, the downward force of gravity on an Earth satellite is: | about 10% weaker than on the surface of the Earth |
| The energy needed for a mass to escape the Earth's gravity is how much more than that needed to achieve low Earth orbit? | Twice as much` |
| T/F The international space station orbits Earth about 250 miles above the surface | True |
| T/F Satellites in low Earth orbit move at about 5 miles per second | True |
| T/F The higher the orbit, the slower the satellites moves | True |
| T/F The pull of gravity on astronauts in the space station is only a little bit smaller than the pull when they are on Earth | True |
| T/F Geosynchronous satellites are those that can be seen with the naked eye | False |
| A commercial aircraft accelerates from zero to 156 mph in 35 seconds. How much is the acceleration? | 0.2g |
| Gravity boosts | speed up spaceships while slowing down planet's but the planet's slowdown is negligibly small |
| Which of these is likely to be the most practical method to send materials to Earth orbit in the next decade | chemical powered rockets |
| Helium has two protons. Helium-3 has: | one neutrons |
| A fatal dose of radiation (all at once) would be: | 10 sieverts (10Sv) |
| The linear-no-threshold hypothesis is | widely used though it is not proven |
| A sample of organic matter contains 1/8 part per trillion. How long has this sample been dead? | 15,000 years |
| Suppose you start with $1, then increase it just 10% Then you increase your total by 10% again. Then again. Then again. How much money will you have after doing this 25 times? | $10 |
| Moore's law refers to | shrinking transistor size |
| Compare to TNT Remember: chocolate chip cookies have 4kcal per gram How much energy in TNT? | 1 kcal per gram |
| A nuclear reactor cannot explode like a nuclear bomb because | the nuclear reactor depends on slow neutrons |
Created by:
bella_grace11
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