Question

27. A satellite is revolving around the earth such
that its minimum and maximum distance from
earth's surface are 800 km and 2400 km
respectively. Calculate velocity of satellite when
its distance from earth is minimum
(given radius of earth = = 6400 km)
(1) 7.91 x 103 m/s (2) 7.91 x 104 m/s
(3) 6 x 103 m/s
(4) 9 x 103 m/s
​

Answer 1

Answer:7.91 * 103

Explanation:given maximum and minimum are 800 and 2400 km then radius will be 800 +2400/2 which gives 1600

At the minimum distance the velocity of satellite will be given by  KE +PE

1/2 m* v1 2 + (-gMm/2R)