Conservation of energy
Which process best shows the conversion of solar energy to chemical energy? F: Prevailing winds causing windmills to spin G: Green plants making their own food H: Uranium producing heat to make steam J: Tides generating electricity
An inventor claims to have created an internal combustion engine that converts 100 k. J of chemical energy from diesel fuel to 140 k. J of mechanical energy. This claim violates the law of conservation of — F: momentum G: inertia H: energy J: mass
Only 10% of the electrical energy operating a lightbulb is changed into visible light. Which instrument helps identify the energy change occurring to most of the remaining 90%? F: G: H: J: Triple-beam balance Thermometer Magnifying glass Prism
Heat Transfer
Problem 12 The moon’s surface becomes hot during the long lunar day because the sun transfers heat to the moon. This heat transfer is accomplished almost entirely through the process of — F convection G refraction H conduction J radiation
Problem 13 A man who was sleeping wakes up because he hears the smoke alarm go off in his house. Before opening the bedroom door, the man feels the door to see whether it is warm. He is assuming that heat would be transferred through the door by — A conduction B convection C radiation D compression
Problem 14
Problem 15
Which of these is an advantage of producing electricity using solar power plants rather than using coal-fired power plants? A Solar power plants can operate for about 10 hours per day. B Solar power plants can produce variable amounts of energy. C Solar power plants produce fewer pollutants. D Solar power plants require continuous sunlight.
A company has decided to market itself as environmentally friendly. If the company is going to sell calculators, the use of which energy source would produce the fewest by-products and the least waste? F Rechargeable batteries G Solar cells H Dry-cell batteries J Tesla coils
In West Texas and Southern California, high winds drive turbines that generate electricity. One advantage that wind energy has over energy generated from solar cells is that wind energy — A B C D is plentiful everywhere can be generated at night produces cleaner energy is free of environmental hazards
circuits
circuits : Problem 23
Problem 24
Problem 25
Which circuit is built so that if one light bulb goes out, the other three light bulbs will continue to glow?
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