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Problems & Exercises

1.

(a) 27 . 8 m/s 27 . 8 m/s

(b) 62.1 mph62.1 mph

3.

1.0 m s = 1 . 0 m s × 3600 s 1 hr × 1 km 1000 m 1.0 m s = 1 . 0 m s × 3600 s 1 hr × 1 km 1000 m

=3.6 km/h=3.6 km/h.

5.

length: 377 ft377 ft; 4.53×103 in.4.53×103 in. width: 280 ft280 ft; 3.3×103 in3.3×103 in.

7.

8 . 847 km 8 . 847 km

9.

(a) 1.3×109 m1.3×109 m

(b) 40 km/My40 km/My

11.

2 kg

13.

(a) 85 to 95 km/h 85 to 95 km/h

(b) 53 to 59 mi/h 53 to 59 mi/h

15.

(a) 7 . 6 × 10 7  beats 7 . 6 × 10 7  beats

(b) 7 . 57 × 10 7  beats 7 . 57 × 10 7  beats

(c) 7 . 57 × 10 7  beats 7 . 57 × 10 7  beats

17.

(a) 3

(b) 3

(c) 3

19.

(a) 2.2%2.2%

(b) 59 to 61 km/h59 to 61 km/h

21.

80 ± 3 beats/min 80 ± 3 beats/min

23.

2 . 8 h 2 . 8 h

25.

11.4 ± 0.6 cm 3 11.4 ± 0.6 cm 3

27.

12 . 06 ± 0 . 04 m 2 12 . 06 ± 0 . 04 m 2

29.

Sample answer: 2×1092×109 heartbeats

31.

Sample answer: 2×10312×1031 if an average human lifetime is taken to be about 70 years.

33.

Sample answer: 50 atoms

35.

Sample answers:

(a) 10121012 cells/hummingbird

(b) 10161016 cells/human

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