qz1sol_3695sp10

# qz1sol_3695sp10 - 3 km ×(1000 m/1 kg = 6.37 × 10 6 m The...

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TA: Tomoyuki Nakayama Tuesday, January 12 th , 2010 PHY 2048: Physic 1, Discussion Section 3695 Quiz 1 (Homework Set #1) Name: UFID: Formula sheets are not allowed. Calculators are allowed. Do not store equations in your calculator. You need to show all of your work for full credit. ________________________________________________________________________________ Earth is approximately a sphere of radius 6.37 × 10 3 km. a) What is its circumference in meters? First we express the radius in meters. 6.37 × 10 3 km = 6.37 × 10
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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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