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  1. Class 9
  2. Chapter 8 Class 9 - Motion

Transcript

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 = 2๐œ‹r = 2 ร— 22/7 ร— 42250 = (2 ร— 22 ร— 42250)/7 km Radius of the orbit = 42250 km Time taken = 24 hours Distance travelled by the satellite = Circumference of circle = 2๐œ‹r = 2 ร— 22/7 ร— 42250 = (2 ร— 22 ร— 42250)/7 km Average Speed = 232375/21 km/h = 232375/21 ร— ๐‘˜๐‘š/โ„Ž๐‘Ÿ = 232375/21 ร— ๐‘˜๐‘š/(3600 ๐‘ ๐‘’๐‘๐‘œ๐‘›๐‘‘๐‘ ) = 232375/(21 ร— 3600) km/s = 232375/(21 ร— 3600) km/s = 9295/(21 ร— 144) km/s = 9295/3024 km/s = 3.07 km/s

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CA Maninder Singh is a Chartered Accountant for the past 9 years and a teacher from the past 16 years. He teaches Spoken English, Written English, Grammar and Vocabulary at Englishtan.