Please answer all 3 questions thank you!! 1. Light travels about 9 Pm in a year.

Question

Please answer all 3 questions thank you!!

1. Light travels about 9 Pm in a year. Given that a year is about 3 × 107 s, what is the speed of light in meters per second?

2. Suppose we want the formula for the volume of a sphere. The two expressions commonly mentioned in elementary discussions of spheres are 4?r2 and 4?r3 /3. One is the volume of a sphere of radius r and the other is its surface area. Which one is the volume?

3. the mass of the atmosphere is 1019 kg. Assuming the density of the atmosphere is 1 kg/m3 , estimate the height of Earth’s atmosphere. Do you think your answer is an underestimate or an overestimate? Explain why.

Explanation / Answer

1)

Distance d = 9 Pm = 9 x 1015 m

time t = 3 x 107 s

We knoe,

speed c = d/t

= (9 x 1015)/(3 x 107)

= 3 x 108 m/s

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