# Answers to Even Numbered Assigned Problems

Chapter 1:

P 2.  (a)86,900, (b)7,100, (c) 0.66, (d) 0.0000862

P 12.  (a) 1 Mvolt, (b) 1 microvolt, (c) 5 kdays, (d) 0.8 kbucks, (e) 8 npieces

Chapter 2:

P 6. 300 m/s

P 26. 40 g

P 36. (a) 32 m, (b) 5.1 s

P 40. (a) 4.85 m/s, (b) 0.990 s

P 44. (a) +/- 12.8 m/s, (b) 0.735 s, 3.35 s, (c) on the way up and on the way down

Chapter 3:

P 32. (a) 1.13 m, (b) 0.54°

P 36. (a) 14.6 s, (b) 1.22 km, (c) 83.9 m/s, -79.9 m/s, (d) 116 m/s, 43.6° below the horizontal

Chapter 4:

P 10. 1.29 x 103 N in the direction of the ball’s motion

P 16. 2.5 m/s2 down

P 28. (b) 62.2 N, (c) 204 N, (d) 100 N

P 30. (a) 29 N, 59 N, (b) 34 N, 68 N

P 44. 4.1 m

P 56. 101N, m k = 0.719

Chapter 5:

P 8. (a) 3.14 N, (b) 9.02 N

P 20. 0.23

P 30. gh = 0.91 gsurface

Chapter 6:

P 40. vB = 24 m/s, vC = 9.9 m/s, vD = 19 m/s

Chapter 7:

P 4. 1.6 x 104 kg

P 16. (a) 2.0 N-s, (b) 400 N

P 18. (a) 460 kg m/s east, (b) -460 kg m/s west, (c) 460 kg m/s east, (d) 610 N east

P 30. 0.61 m

Chapter 8:

P 30. (a) 38 m-N, (b) 33 m-N

Chapter 9:

P 12. 3.9 x 103 N, 3.4 x 103 N

P 18. 1.1 m from pivot on side of lighter boy

P 26. FT = 542 N, Fhingex = 409 N, Fhingey = -6 N (down)