F.3 Maths (20 pts!!!)

[匿名]

2010-07-29 12:48 am

1. The average distance between the Sun and the Earth is about 1.495x10^8 km. It is given that the sunlight travels at a speed of 3x10^8 m/s. Find the travelling time for the sunlight to reach the surface of the Earth. (Give your answer correct to the nearest second)

Please show me every step.

Thanks a lot!

If you answer it by step, you will get 20 points.

回答 (1)

用戶2053

2010-07-29 1:01 am

✔ 最佳答案

Travelling time = distance / speed= (1.495x10^8 km) / (3x10^8 m)= (1.495x10^8 x 10^3 m) / (3x10^8 m) ........(1 km = 1000 = 10^3 m)= (1.495x10^11) / (3x10^8) = (1.495/3) x (10^11 / 10^8) = (1.495/3) x (10^3) = (1495/3) = 498.333...Answer is 498 s (correct to the nearest second)

2010-07-28 17:06:25 補充：
Travelling time
= distance / speed
= (1.495x10^8 km) / (3x10^8 m)
= (1.495x10^8 x 10^3 m) / (3x10^8 m) ........(1 km = 1000 = 10^3 m)
= (1.495 x 10^3) / 3
= 1495/3
= 498.333...
Answer is 498 s (correct to the nearest second)

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