Page 238 - Physics

Physics for Secondary Schools

Answers to Revision exercise 8 Exercise 9.3
1. (i) c (iv) c 1. 2 000 W
(ii) d (v) d 2. (a) 100 KJ (b) 200 W

(iii) a (vi) b 3. 60 W

2. (a) vii (e) viii 4. (a)16 hp (b) 1 865 W
(b) i (f) ii 5. (a) 1 000 J or 1 kJ
(c) ix (g) v (b) (i) 500 J (ii) 1 000 J or 1 kJ
(d) iii
Answers to Revision exercise 9
3. (c) 182.8 s 1. (i) b (vi) b
4. (b) 74 s (ii) d (vii) a
5. (a) 200 km

(b) 0 km (iii) c (viii) b
(ix) a
(iv) b
(c) 66.67 km/h (v) b (x) a
(d) 0 km
2. (i) B (iv) I
8.(b) (i) 8.5×10 m/s 2 (ii) J (v) G
-3
(ii) 2.5×10 m/s 2 (iii) E
-2
(iii) 13.39 m/s
4. (c) 9.25 hp
9. (a) 125 m (b) 50 m/s 6. (a) 500 J (b) 0 J

13. 0.32 s 7. 2 000 J
14. 18.05 m 9. 112 500 J
15. 10 s 10. 900 000 J, 9 times
11. Rock B

Chapter 9 12. 2 250 J
13. (i) 585 J (ii) 600 J
Exercise 9.1
1. 3 000 J 14. (b) (i) 75 J
2. 600 J (ii) 75 J
3. 300 J (iii) 7.07 m/s
5. 1 800 J 15. 5 kg object
16. 300 000 J
Exercise 9.2 17. 4 J

2. (a) 3.2 J (b) 4 000 J 18. 1.7 m
3. (a) 2 000 J (b) 2 000 J 19. 52.125 J
4. 12.5 (Nm) J
5. 6.0 J 20. 0.6 J

232
Student’s Book Form One

Physics Form 1 Final.indd 232 16/10/2024 20:59