Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

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1 ch 7 and 16 review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. The heat released by a burning candle is an example of thermal energy. 2. Increasing the height of an object will increase the potential energy of the object. 3. Radiant energy is made up of electromagnetic waves. 4. The unit used to measure the size of an electric charge is the ampere. _ 5. In many circuit diagrams, any electrical device that uses energy is shown with a resistor symbol. _ 6. A closed circuit has a break in it. _ 7. The ampere is a unit of measurement for voltage. _ 8. Electric current flows easily through a conductor. _ 9. The elements, germanium and silicon, are used in computer chips and other electrical devices, and are examples of insulators. _ Completion Complete each statement. Select the correct term to complete each sentence. There are extra terms in the list. radiant efficiency simple machines power nuclear complex machines work input output increases decreases mechanical advantage potential kinetic energy 10. The expression mgh represents energy. 11. The expression represents energy. 12. is the ability of an object to change or cause changes. 13. The radiant energy given off by the Sun is formed from energy. 14. As a car travels up a hill, its potential energy. 15. As a car rolls down a hill, its potential energy.

2 Select the correct term to complete each sentence. There are extra terms in the list. semiconductor resistor superconductor current voltage chemical positive negative neutral ammeter circuit static increase decrease circuit breaker 16. Electricity flows through a complete path called a(n). 17. An object that has equal amounts of positive and negative charge is considered to be electrically _. 18. The tiny imbalance of charge that develops on your body as you scuff your feet along a carpet is called electricity. 19. Charge is caused to flow by the difference in the between two points in circuit. 20. A battery transforms energy into electrical energy to move charges. 21. Devices that can be used to measure current in a circuit include the multimeter and the. 22. Fuses protect a circuit from too much current by creating a break in the circuit but must be replaced. A device that may be reset while providing the same protection is a(n) _. 23. As more resistors are added in parallel, the total circuit resistance. Problem 24. How much kinetic energy does a 1,000-kg car have when it is traveling at 30 m/s? 25. How much potential energy is held by a 2.0-kg can of paint on top of a 2.0-meter ladder? 26. How much gravitational potential energy is contained by a 1,000-kg car traveling at 20 m/s? 27. Kendra has a mass of 50 kg. What is her kinetic energy while she is walking at 2 m/s? A rubber ball with a mass of 0.1 kilogram is thrown straight up with a speed of 20 m/s.

3 Figure Calculate the height to which the ball in Figure 7-2 travels. 29. The rubber ball in Figure 7-2 is replaced with a steel ball with a mass of 2 kg. If the steel ball is still thrown straight up with a velocity of 20 m/s, how high will it travel?

4 ch 7 and 16 review Answer Section MODIFIED TRUE/FALSE 1. ANS: T PTS: 1 DIF: basic REF: section ANS: T PTS: 1 DIF: basic REF: section ANS: T PTS: 1 DIF: basic REF: section ANS: F, coulomb 5. ANS: T PTS: 1 DIF: basic REF: section ANS: F, open 7. ANS: F current electrical current PTS: 1 DIF: basic REF: section ANS: T PTS: 1 DIF: basic REF: section ANS: F, semiconductors PTS: 1 DIF: basic REF: section 16.3 COMPLETION 10. ANS: potential gravitational potential 11. ANS: kinetic 12. ANS: energy 13. ANS: nuclear 14. ANS: increases

5 15. ANS: decreases 16. ANS: circuit 17. ANS: neutral 18. ANS: static 19. ANS: voltage 20. ANS: chemical 21. ANS: ammeter 22. ANS: circuit breaker 23. ANS: decreases PTS: 1 DIF: basic REF: section 16.4 PROBLEM 24. ANS: PTS: 1 DIF: intermediate REF: section ANS: PTS: 1 DIF: intermediate REF: section ANS: zero Gravitational potential energy is the energy due to position. Since the car is not elevated, it doesn t contain potential energy.

6 PTS: 1 DIF: intermediate REF: section ANS: PTS: 1 DIF: intermediate REF: section ANS: PTS: 1 DIF: advanced REF: section ANS: 20 m The steel ball will travel the same height as the rubber ball. The initial velocity of the ball is what determines the height. The mass cancels out of the equation. PTS: 1 DIF: advanced REF: section 7.2

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