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Q.

An artificial satellite is moving in a circular orbit of radius 42250 km. What is its speed if it takes 24 hours to revolve around the earth__km/hr?


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a

11065.48 

b

1245.98 

c

56248.36 

d

721400.26 

answer is A.

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Detailed Solution

An artificial satellite is moving in a circular orbit of the radius of 42250 km. If it takes 24 hours to revolve around the earth, its speed is 11065.48 km/hr.
Given: radius = 42250 km, time = 24 h
Formula:
Length of orbit = circumference of the orbit
        =2πr
        =2×227×42250
        =265571.43 km
We know,
Speed =length of orbittime
  =265571.4324
             =11065.48 km/hr
 
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