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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?

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a

11065.48 km / h

b

1245.98 km / h

c

56248.36 km / h

d

721400.26 km / h

answer is A.

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Detailed Solution

The speed of the artificial satellite is

11065.48 km / h

.
Given: radius

= 42250 km

,
time

= 24 h

Formula:

Length of orbit = circumference of the orbit

= 2 πr

= 2 \times \frac{22}{7} \times 42250

= 265571.43 km

We know,
Speed = length of orbit/time

= \frac{265571.43}{24}

= 11065.48 km / h

.

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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?