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1. How many people can be lifted one story with a Megajoule

"And Power A small engine can do as much work as a large engine. The large engine can do the work more quickly.

2. A motor can do 1 joule of work in 1 second. Find its power.

3. How much energy is needed to light a loo watt bulb for a minute ?

4. The Philadelphia Electric Company (PECO) charges about $.18 for a kilowatt hour of electricity. How many joules is this ?

5. What does it cost if you leave a 100 watt light bulb on overnight ?

6. One horse-power is about 750 watts. How many horsepower is a 10 kwatt motor ?

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