### Physics 2A Even Problem Answers

Chapter 2

2. (a) 1.74 m/s; (b) 2.14 m/s

4. 48 km/h

28. a)5.00 s b)61.5 m c) graph

30. (a) 2.5 s

36. (a) 56.6 s; (b) 31.8 m/s

38. (a) 32.9 m/s; (b) 49.1 s; (c) 11.7 m/s

60. 26 m

64. (a) 8.0 m/s2; (b) 20 m/s

66. (a) 0.13 m; (b) 0.50 m

68. 5.0 m/s

72. (a) 15.7 m/s; (b) 12.5 m; (c) 82.3 m

78. yes, 0, 10 m/s

82. 39 m/s

90. (a) 15 m; (b) 2.0 m/s; (c) –2.0 m/s2; (d) 3.5 m/s; (e) 0

92. (a) 60.6 s; (b) 36.3 m/s

94. 34 m

Chapter 3

6. (a) 4.28 m; (b) 11.7 m

12. (a) 81 km; (b) 40 north of due east

14. (a) –80 m; (b) 110 m; (c) 143 m; (d) 168

20. (a) 5.0 km; (b) 4.3º south of due west

28. (a) 0.84 m; (b) 79 south of due east

46. (a) 4.2 m; (b) 50 north of due east; (c) 8.0 m; (d) 24 north of due west

62. (a) 1.8 m; (b) 69 north of due east

Chapter 4

8. (a) 1.08x10^3 km; (b) 26.6 east of due south; (c) 480 km/h; (d) 26.6 east of due south;

(e) 644 km/h

12. (a) 56.6 m; (b) 45 north of due west (NW); (c) 1.89 m/s; (d) 45 north of due

west(NW); (e) 0.471 m/s^2; (f) 45 north of due east (NE)

18. (a) 15.8 m/s; (b) 42.6

86. (a) 1030 m; (b) west

Chapter 5

4. (-2 N)i + (6 N)j

20. 6.8 x 10^3 N

14.(a) 2.0 N; (b) down

34. (a) 566 N; (b) 1.13 kN

36. (a) 68 N;(b) 73 N

48. 176 N

50. (a) 36.8 N;(b) 19.1 cm

52. 5.1 m/s

58. (a) 466 N;(b) 527 N;(c) 931 N;(d) 1.05 kN;(e) 931 N;(f)1.05 kN;(g) 1.86 kN;(h) 2.11 kN

78. 4.6 N

86. (a) 7.4 x 10^2 N;(b) 2.8 x 10^2 N;(c) 0;(d) 75 kg

Chapter 6

20. 8.5 N

46. (a) 547 N;(b) 9.53

48. (a) 3.7 kN;(b) up;(c) 1.3 kN;(d) down

66. 8.8 N

70. (a) 0.40 N;(b) 1.9 s

82. 178 km/h

88. 9.4 N

Chapter 7

8) 5 kJ

10)6.8 J

14)15.3 J

18)a)36 Kj b)200 J

24)a)1.31 J b)0.935 m/s

32)a) 16J b)16 J c)0 d)-14J

36)25J

44)a)900J b)110W c)230W

58)a)590 J b)0 c)0 d)590J

62)a)0.29J b)-1.8J c)3.5 m/s d)23 cm

68)1.5 kJ

Chapter 8

4) (a) 1.51 J;(b) –1.51 J;(c) 0;(d) –1.51 J;(e) 1.51 J;(f) 0;(g) same

6)(a) 0.15 J;(b) 0.11 J;(c) 0.19 J;(d) 38 mJ;(e) 75 mJ;(f) all the same (a) 0.15J

(b) 0.11 J;(c) 0.19 J;(d) 38 mJ;(e) 75 mJ;(f) all the same

10) (a) 12.9 m/s;(b) 12.9 m/s;(c) increase

20) (a) 5.0 m/s;(b) 79;(c) 64 J

22. (a) 4.4 m;(b) same

Chapter 9

18) 4.9 kg.m/s

22) (a) 30.0;(b) (-0.572 kg.m/s)j

24) (a) 1.1 m;(b) 4.8 x 10^3 kg.m/s

28) (a) 9.1 N•s;(b) 1.8 x 10^3 N

42) mv^2/6

54) 2.6 m

58) 33 cm

Chapter 10