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Q.

A satellite is orbiting around earth in orbit very close to earth surface in equatorial orbit with a rotation period 1.5hrs. If at an instant it is vertically above a point p on earth surface, find the time after which it will again come above p (if it is moving from east to west).

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a

1.4hrs

b

1.1 hr

c

1.3hrs

d

1.2hrs

answer is D.

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Detailed Solution

$t_{1} = \frac{θ}{ω e} = \frac{2 π - θ}{ω s} \frac{2 π}{ω_{c} + ω_{s}} = \frac{2 π}{\frac{2 π}{24} + \frac{2 π}{1.5}} = 1.4 h r$

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