A cosmonaut is orbiting earth in a spacecraft at an altitude h = 630 km with a speed of 8 km/s. If the radius of the earth is 6400 km, the acceleration of the cosmonaut is
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A
Acceleration of cosmonaut is a = 
a = 
where r is the distance of cosmonaut from earth's centre.
Given v = 8 km/s = 8000 m/s,
r = (6400 + 630) km = (6400 + 630) × 1000 m
∴ a = 
= 9.10 m/s 2
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