JEE Main 2024 Physics question
An astronaut takes a ball of mass m from earth to space. He throws the ball into a circular orbit about earth at an altitude of 318.5 km. From earth's surface to the orbit, the change in total mechanical energy of the ball is . The value of x is (take = 6370 km):
Answer: (A)
Solution
h = 318.5 km ≈ /20. Initially = −/ (ball on the surface). In the circular orbit = −/ + h)) =
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