NSCI 110 draft Exam for Chapters 6&7, 11/18

Name:_________________________________________

Open book, open notes. Show your work, otherwise partial credit cannot be awarded. Be sure to include units in the work and in the answer. You must do your own work.

~5 points per question, ~60 points possible.

1. Why is (b) the answer to question 12 on page 187?

2. Why is (a) the answer to question 13 on page 187?

3. Why is (d) the answer to question 27 on page 188?

4. Why is (d) the answer to question 30 on page 188?

5. Why is (a) the answer to question 51 on page 189?

6. Why is (b) the answer to question 52 on page 189?

7. What are the advantages and disadvantages of using parallel circuits for household circuits?

8. What are the basic similarities and differences between an electric field and a magnetic field?

9. What is the charge of 16 electrons in units of Coulombs?

10. What average current in units of amperes would these 16 electrons generate if they flowed past the middle of a wire over 16 seconds?

11. A lightbulb designed to operate in a 120.0 V circuit has a resistance of 96 Ohms. At what rate does the bulb use electric energy?

12. What is the monthly energy cost of leaving a 60 watt bulb on continuously if electricity costs $0.10 per kWhr?

13. Is it possible to simultaneously operate two 950 W coffee pots on the same 120 V circuit without tripping a 15 A circuit breaker? Explain.

14. What is the power of an 8 ohm bulb when four of such bulbs are connected in a 12 volt series circuit?

15. Why is (b) the answer to question 17 on page 218?

16. Why is (c) the answer to question 24 on page 218?

17. Why is (b) the answer to question 29 on page 218?

18. Why is (c) the answer to question 31 on page 219?

19. Why is (b) the answer to question 48 on page 220?

20. According to the relationship between frequency and energy of electromagnetic radiation (E = hf), what type of photon has the most energy?

21. What is the speed of light while traveling through ice?

22. How much time is required for star light to travel 2.4E17 km from the center of our Galaxy to the Earth?

23. The wavelength of light from a monochromatic source is measured to be 6.1 x 10^-7 m. (a) What is the frequency of this light? (b) What color would you observe?