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Q1
Figure 2 shows how the length of a satellite orbit depends on the height of the satellite above the Earth’s surface.
A satellite orbits 300 km above the Earth’s surface at a speed of 7.73 km/s.
Calculate how many complete orbits of the Earth the satellite will make in 24 hours.
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Number of complete orbits = __________________________ (5)
-
The length of the orbit is 42,100 km.
distance
=
speed
×
time
distance=speed×time
So:42
100
=
7.73
×
time
42100=7.73×time
time
=
42
100
7.73
=
5446
seconds
time=
7.73
42100
=5446 secondsThere are
24
×
3600
=
86
400
24×3600=86400 seconds in a day.Number of orbits
=
86400
5446
=
15.86
Number of orbits=
5446
86400
=15.86
Rounding down:Number of full orbits
=
15
Number of full orbits=15
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