WAEC Physics 2021 Theory — Question 3

Question 3 of 35 from the West African Examinations Council (WAEC) Physics 2021 Theory paper, with the correct answer and a full explanation.

2(b). A geostationary satellite moves in an orbit of radius 6300 km. Calculate the speed with which it moves in the orbit. [π=22/7]

Model answer

A geostationary satellite completes one revolution in T=24 hr=86,400 s. Speed v=2πR/T = (2×22×6,300,000)/(7×86,400) ≈ 458.3 m/s.

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