Energy Transformations Choose the sequence of energy forms that best fits each item.

1. Flashlight a. chemical energy→ electrical energy→ light energy
2. Electric saw b. electrical energy → thermal energy
3. Toaster c. electrical energy → mechanical energy
4. Gas Scooter d. mechanical energy → electrical energy
5. The Sun e. mechanical energy → sound energy
6. Wind Turbine f. chemical energy → electrical energy →sound energy
7. iPod g. chemical energy → thermal energy →mechanical energy
8. Speaker vibrates h. nuclear energy → light energy and heat energy

(9) energy from gas, oil, or coal provides
(10) energy to produce steam. A turbine changes the energy of the steam into the
(11) energy of the rotating turbine and generator. The generator converts this energy into
(12) energy. The lamp is an energy converter, changing (13) energy to
(14) energy.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?