Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m

What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A)

7.18 × 103 m/s
B)

7.84 × 103 m/s
C)

8.23 × 103 m/s
D)

11.0 × 103 m/s
E)

13.4 × 103 m/s


B

Physics & Space Science

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Physics & Space Science