人教版物理八年级上册练习册答案

1. M 103 109 2. S h min 60 3600 3. 4. 5. 1. 2.5*10-3 2.5*10-62. 0-10CM 1mm3. 1cm 2.4 1mm 2.404. 30s 0.2s 15min 0.5min 217.5s(337.5)5. C6. B1. 2.5*105m 3.6*106 cm 9*109 um100s 1.6min 1min30s2. 17.28cm 17.82cm3. 1mm 2.85 0.894. c5. D6. D7. C8. bdac c d=L/509. (1) (2)145 (3) s l(4) 1. 2. 3. 4. 1. 2. 3. 4. 5. 6. D1. 2. 3. 4. C5. C6. B7. B8. D9. A10. C11. 1. 2. S/t3. 18 154. 5. V=S/t 1. 2. 2 2m3. B C A4. 5. A6. D7. C1. 2. 0.23. 80 0.54. 12 5 2 15 35. D6. B7. C8. B9. (1)40KMH 2t=s/v=550m / (40/3.6)m/s=49.5s10. (1) V=S/t=100m/80s=1.25m/s (2)s=vt=1.25m/s*20*60s=1500m (3)11. 160KM/H(2)120km/h (3)d41225262.5h4 1. 2. V=S/T3. 0.1 0.124. 0.751. 52. 1.93. 0.03m/s 0.02m/s 0.024m/s4. B5. A6. (1) 2V=S/T 3 0.1 0.12 41. 15 2 20 2.52. 4.633. 4 4.4 4.254. D5. C6. A7. (1) 2V=S/T 38. 17.8 m/s 25 9.5 m/s 3 9. 19 16 2 320 m/s CD10. 18min (2) V=S/T=6000m/480s=12.5 m/s