Conceptual Physics

Answers to selected problems

Chapter 7 Answers

C.1 No

Answers vary

C.3 (a) They have the same momentum
(b) A's kinetic energy is greater

C.5 Truck impulse equal

C.7 Center of mass

Answers vary

0.1 (a) Yes
(b) No
(c) Yes

1.1 1.29 kg·m/s

1.3 31 m/s

1.5 90 kg·m/s

2.1 2.8e2 kg·m/s

3.1 -1.73e+3 N

3.3 25800 N

3.6 (a) 1.13e3 kg·m/s
(b) 4.50e4 N

3.8 (a) 4.0 N

(b) 12 kg·m/s

(c) 80 m/s

3.10 2.79e+3 N

3.12 (a) í4.09eí23 kg·m/s
(b) 0.205 N

5.1 -1.26e+3 m/s

5.3 í3.25 m/s

5.5 (a) í0.43 m/s

(b) 0.77 m/s

8.1 32 N

8.2 118 kg

9.1 (a) 2.3 kg

(b) 3.1 m/s

9.3 (a) 8.1 kg
(b) í1.9 m/s

12.1 6.0 m/s

13.1 (a) í0.40 m/s

(b) í3.6 m/s

(c) í1.8 m/s

13.3 0 m/s

13.5 2.0 kg·m/s

13.7 (a) 3.34 m/s
(b) No

14.1 4.7e6 m

14.3 (a) 6.0 m

(b) 6.3 m

16.1 (a) Impossible

(b) Elastic

(c) Inelastic

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