Phys 221 Homework

Spring 2012

 

 

 

Assignment

Even Answers

 Due

Sound and Wave Basics

1/11/12

HW #1

Watch Khan Intro to A, T, f, l

Read

Ch. 13 CQ 9, Problems 41, 43, 45, 46, 51, 52 (m is mass/length

Ch 14 CQ 2, 6,

Describe in detail the difference between resonance and sympathetic/forced vibration. For a piano what is the source of vibration, how pitch is changed and what amplifies the sound?

46. 5.7 mm

52.a) eq1: time eq 2: mass x length/time2

b) 1: period 2: force

1/17/12

Watch Khan Mach Numbers

1/18/12

HW #2

Khan “graphs of sin and cosine” problems.  Print sheet showing your status bar full from blue all the way to bright red.

Ch 14 CQ 3, 8, 11 Problems 1, 4, 6, 10, 13, 17, 24, 26, 27, 29, 62

4. 0.196 s

6. 17.3m, 0.0173m

10. 1000 w/m2

24. a. 10,000 Hz b. 3333 Hz

26. behind 31.8 m/s

62. 1000 (1024 ok also)

1/24/12

Perception Activity/Homework

1/27/12

HW #3

Ch 13 problem 42 (for part c find the frequency not the angular frequency), additional problems. Notice that 64 b. asks for wave speed not particle speed.

42. d. v = .031 m/s, e. a= .049 m/s2 f. x = 0.02m sin (0.5p t)

Addt Prob:

1. a. 0.015m, b. 1/6s, c. 6hz, e. v = 0.57 m/s cos (12p t), a = -21 m/s2 sin (12p t) f.  0.57 m/s

64. a. 15 cm b. 0.15 m/s

1/31/12

HW #4

Ch 13 CQ 4, 7 Problems 1, 3, 4 (c. what is the slope of the graph in b.?), 9, 15, 19, 21, 27, 35, 37, 39

4. a. 110 N, c. 1000 N/m

2/3/12

Read about Elephant acoustics

 

2/6/12

EM Waves Reading HW,

Mirror Tut HW

2/13/12

HW #5

CH 21 Problems 49, 61, 66

Ch 22 CQ 3, Problems  2, 5, 9, 19

Additional Problems

66. 1.1 x 107 m/s

2. a. 1.989 x 10-15 J

b. 12,400 eV

2/17/12

Sign conventions for mirrors and lenses

HW #6

Ch 22 problems 29, 34, 35

Ch 23 CQ 1, 4, 6 Problems 3, 6, 8, 13, 14 (include ray diagrams for 13 and 14)

Additional Problems

 

T. rex solution

34. a)43.3o b) 42.2o, c) 40.4o

6. a) 2.22 cm, b) 10.0

8. -0.790 cm

14. a) 60cm b) q = 42.9 cm, M = -0.429 real, inverted, 42.9 cm in front of mirror c) q = -15.0 cm, M = 1.50, virtual, upright, 15.0 cm behind mirror

T. rex: q =-10/11m, h’ = 5/11m

2/24/12

HW #7

Ch 23 CQ 11, 12, 13 problems 29, 31, 33 (include ray diagrams for 31, 33)

Ch 25 CQ 7, 11, 14 problems 9, 11

Additional problem

solution

3/2/12

HW #8

Retina and Color Vision

3/9/12

HW #9

Ch 15 CQ 2,4,6,13 problems 11, 30 additional problems

Solution pg1, pg2

3/23/12

HW #10

Ch 16 CQ 1, 4, 7, 10, 14 Problems 3, 7, 13, 23, 25 additional problems

Solution pg1, pg2

3/28/12

Ch 15 & 16 Equations

HW #11

Ch 17 CQ 1, 6, 7 Problems 1, 11, 20, 23, 34, 42, 50, 54

20. 5 x 105V

34.a. $0.29, b. $2.60

42. a. 0.66 kWh, b. $0.079

50. 15.0 h, 54. 90 mV

3/30/12

HW #12

Ch 18 CQ 2(you can use 1, 2, or 3 bulbs at a time – assume the bulbs are identical.), 8, 10 Problems 2, 5, 7, 9, 14, 22, 31, 34, 37, 38

CQ2. 7 possibilities

2. a. 27W,  b.0.44A,

c. 3.0W, 1.3A 14. Yes, Req = 8.00W, b. 2.25A, c. 40.5W 22. a. 60.0 W , b. 0.20A, c. 2.4W, d.0.50W, 34. 1.3 x 102 mC, 38. 8.0 A, 120 V, 0.80 A, 5.8 x 102 W

4/10/12

HW #13

Ch 19 CQ 2, 4, 5, 6, 8, 13, 17 Problems 4, 10, 11, 13, 17, 43, 44, 45

4. top, out, zero, in  10. 807N, 44. Left, out, left to right

4/17/12

HW #14

Ch 27 CQ 2, 8, 9, 16 Problems 9, 10, 12, 27, 28, 30

Ch 28 CQ 2, 8, 10, 15, Problems 10 (hint: find part c first), 13, 14

Ch 29 CQ 1, 3, 6, 8, 13

Ch 30 CQ 2, 4

Ch 27 10. a. 288nm, b. 1.04 x 1015 Hz, c. 1.19 eV  12. A. only lithium, b. 0.81 eV  28. A. 1.99 10-11 m, b. 1.98 x 10-14 m

Ch 28 10. a. 1.281 x 10-6 m, b. 2.34 x 1014 Hz, 0.970 eV  14. A. 12.1 eV, b. 12.1 eV, 1.89 eV, 10.2 eV

4/24/12