Unformatted text preview: 3 km × (1000 m/1 kg) = 6.37 × 10 6 m The circumference is given by 2πr, where r is the radius. We get l = 2πr = 2 × 3.14 × 6.37 × 10 6 = 4.00 × 10 7 m b) What is its surface area in square meters? The surface area is given by 4πr 2 . Therefore A = 4πr 2 = 4 × 3.14 × (6.37 × 10 6 ) 2 = 5.10 × 10 14 m 2 c) What is its volume in cubic meters? The volume of a sphere is given by 4πr 3 /3. Thus we have V = 4πr 3 /3 = 4 × 3.14 × (6.37 × 10 6 ) 3 /3 = 1.08 × 10 21 m 3...
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 Fall '08
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 Physics, Work, SI prefix, Tomoyuki Nakayama

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