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Cape Physics answer sheet
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7/21/2019 Cape Phys 1023 Launch
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Answers to revision and practice exam questions
Module 1
Answers to revision questions
Revision questions 1 (page 34)
1 b i kg m2 s–2 ii m2 s–2 K–1
3 kg m–1 s–1
4 kg m–1 s–1
10 Horizontal component = 4.3 N,vertical component = 2.5 N
11 a 14 N b 2 N c 10 N d 12.2 N
15 0.9%
16 R = 12 ± 3 Ω
17 i 3.3% ii 6.6%
18 0.43 ± 0.01 cm
21 a 14 m s–1 b 0.65 m s–2 c Approx. 350 m
22 a = –5 m s–2
23 a 9 m s–1 b 24.75 m c 13.4 s
24 a 9.5 m b 6.2 m s–1 c 1.53 s d 11.5 m
25 i 4.3 m s–1 ii 2.5 m s–1 v 0.32 m vi 0.255 s
vii 0.51 s viii 2.19 mix 4.77 m s–1 25.6° below the horizontal
26 b 158 N c 3.68 m s–2 d 188 N
Revision questions 2 (page 46)
1 b 0.23 N c 4.6 m s–2
3 c Kinetic energy = 1.875 J, momentum = 1.5 kg m s–1
4 a Approx. 3 N s c Approx. 25 m s–1
d Approx. 50 m s–2
6 c 3ms–1 in the same direction as the 4 kg mass
9 a 785 N b 785 Nc 0.122 N m−2 s2 d 7.11 m s–2
10 c i 18.6 N ii 25.8 m s–1 iii 9.4 m s–2
11 a 37.2 N b Approx. 1 ⁄ 3(0.337)
12 T 1 = 5.6 N T
2 = 3.9 N
15 b 890 N c 170 N
17 19.4 N at 64.6° to the horizontal
18 a 2.5 × 104 J b 1.23 × 105 Jc 6.0 × 104 J d 15.9 ms–1
Revision questions 3 (page 58)
2 b i 15 360 J ii 14 126 J
iii 1234 J iv 206 N
5 b i 0.52 rad ii 2.44 radc i 180° ii 90°
7 a 2.4 rad s–1 b 2.62 sc 2.88 m s–2 d 2.45 N
8 44.4 N
9 a 16.4 N b 12.4 N
10 a 41.9 rad s–1 b 1.05 × 103m s–2
c 1.02 N d 1.02 N
11 a 1.52 Hz
12 b ii 4.23 × 107 m
14 a 3.68 × 104 N b 8.77 m s–2
c 7.70 × 103 m s–1
15 1.31 × 10–4 rad s–1
16 i 1.99 × 1020 N ii 2.71 × 10–3 m s–2
v –2.71 × 10–3 N kg–1
Module 1 practice exam questions (page 60)
1 C 6 A
2 C 7 B
3 B 8 C
4 D 9 B
5 C 10 D
11 c i 1.5 ± 0.02 ii 4.1 ± 0.1
iii (0.845 ± 0.04) g cm–3
12 a 6.12 × 103 J b 4.17 × 103 J
c 15.6 m s−1
, F = 26.7 N
13 b ii 1.84 × 103 N iii 8.64 × 103 N
iv 1.29 m s–2 v 126 m
vi 1.46 × 105 J vii 3.78 × 105 J
14 c i 2.02 s ii 90.9 m
ii 49.2 m s–1 at 24° below the horizontal
16 b 9.74 N kg–1
c ii 0.22 N kg–1 ii 3.08 × 103 ms –1
iv 0.22 m s–2
18 c i 4.4 m s–1 ii 19.2 N
