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NCERT Question 10 An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth. Radius of the orbit = 42250 km Time taken = 24 hours Distance travelled by the satellite = Circumference of circle = 2πœ‹r = 2 Γ— 22/7 Γ— 42250 = (2 Γ— 22 Γ— 42250)/7 km Radius of the orbit = 42250 km Time taken = 24 hours Distance travelled by the satellite = Circumference of circle = 2πœ‹r = 2 Γ— 22/7 Γ— 42250 = (2 Γ— 22 Γ— 42250)/7 km Average Speed = 232375/21 km/h = 232375/21 Γ— π‘˜π‘š/β„Žπ‘Ÿ = 232375/21 Γ— π‘˜π‘š/(3600 π‘ π‘’π‘π‘œπ‘›π‘‘π‘ ) = 232375/(21 Γ— 3600) km/s = 232375/(21 Γ— 3600) km/s = 9295/(21 Γ— 144) km/s = 9295/3024 km/s = 3.07 km/s

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo