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Physics Exam 3
| Question | Answer |
|---|---|
| Two ways solar energy can be used to produce electricity | Solar panels (direct energy) Boiling Water |
| What applications of solar energy are in use today & why? | Smaller scale because not efficient for bigger |
| Whatâs the difference between active and passive pumps | active: pumps & motors , sophisticated passive: trees on south side, double glass |
| what building on campus uses a trombe wall for solar heating | McCormic |
| Advantages of solar energy | plain, renewable, no greenhous gasses |
| disadvantages of solar | suns not shining, low dilute energy source |
| What is the turbine? | Blaze |
| Where is the generator? | Up on top of the pole |
| What are good locations for wind energy? | High and consistant wind Off the coast The plaines Mountain ridges |
| Advantages of wind energy? | Plain, renewable, no greenhouse gasses, doesn’t require any water |
| Disadvantages of wind energy? | When wind isn't blowing |
| Recent problem involving bats? | Bats flew right in behind blades and didn’t have lung capacity like birds so died |
| In simple terms, how does a piston engine work? | Piston: device goes up and down in cylinder Hot gas goes in piston to cause it to go up and down |
| What is the difference between an external and internal combustion piston engine? | External: combustion engine, fire is outside Internal: Creating hot gas in piston itself |
| What are the two types of internal combustion engines in wide use in the USA? | 1. Gasoline 2. Diesel |
| Which of 2 engine types is lighter? | Gasoline |
| Which of 2 engine types is quieter? | Gasoline |
| Which of 2 engine types is more efficient? | Diesel |
| Which of 2 engine types produces lass carbon monoxide? | Diesel |
| What is octane? | Octane: form of gasoline, hydrocarbon Has 8 carbon atoms |
| What is principle reason for using a higher octane gasoline? | prevents knocking in your engine, If engine doesn’t knock on lowest, not sufficient, wasting money |
| What gasoline changes are made for different times of the year and why? | Going in witer want more volitle Summer want less volitle Spring & fall: gas manufactures change one way to another |
| What gases do gasoline engines emit? | Carbon monoxide Carbon dioxide Nitrogen oxide Organics kind of gasses |
| What have we done to try to reduce these emissions? | Ban lenit gas Cap on nozzle for filling gas (keep gas in) PCD valve Pollution control valve |
| What is a catalytic converter? | Changes carbon monoxide to carbon dioxide (less dangerous) |
| What is reformulated gasoline? | Has a little bit of carbon to burn better |
| Where is reformulated gasoline required? | Originally in higher polluted areas, but now anywhere |
| What happens to temperature as you go underground? | Temp goes up |
| What is geothermal energy used for? | Produce electricity Space heat Water heat |
| How can geothermal energy be used for electricity? | Need a high geothermal energy area (higher temp areas) steam to turbine |
| Areas is in USA and World that use geothermal? | Western States (california, Nevada) Iceland |
| Advantages of geothermal? | Relativley clean ( a little bit of a pollution problem) Renewable (if carefully used) Relativley inexpensive to operate |
| Disadvantages of geothermal? | Cost a lot to build Unavailable in a lot of places |
| How often does high tide occur? | Twice a day/ every 12 hours |
| How do we collect water from tidal energy? | Hydroelectric station |
| How does wave energy work? | Waves bob up and down with a device |
| Advantages of tidal, wave and ocean current for use for energy? | Clean, renewable, no greenhouse gasses |
| Disadvantages of tidal, wave, and ocean current for energy? | Unavailale at some times No well located |
| Where was a new wave system connected to the grid? | Hawaii |
| What other fuels might be used to transportation? | Hydrogen Ethinal Various alcohol Propane |
| What are hybrid cars? | Gasoline engine, electrical batteries |
| What are electric cars? | Runs entirley on electricity, u have to charge it |
| What are examples of biomass? | Plant matter, paper, wood, animal waste |
| Is biomass renewable? | Yes if carefully used |
| Precautions of biomass? | Don't use it too fast & don't wanna use wood |
| What is co-firing? | Burning a little bit of biomass material along with the other stuff |
| Is cofiring good? | Inexpensive and efficient way of burning other materials |
| What USA industry already uses a great deal of bio mass? | Paper industry |
| Benefits of biomass? | : good way of recycling materials, also is carbon neutral (producing some carbon dioxide but the fuel being produced is using it) |
| Problems of biomass? | Not well developed, very dilute fuel *cant use directly in transportation) |
| What are some issues of using corn for ethanol production? | Don't get a lot of energy out of it (30% increase) Using a lot of energy just to get a little bit more Could raise food prices |
| Biomass system used on campus? | Heat, uses hot water |
| What country uses sugar for fuel production? | Brazil, gets a lot more energy |
Created by:
jessicavaubel
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