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InterviewSolution
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The moon subtends an angle of 57 minutes at thebase-line equal to the radius of the earth. What isthe distance of the moon from the earth ? Radius ofthe earth 6.4 x 10° m.(Ans. 3.86 x 108 m) |
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Answer» Let the distance from the earth to the moon equals to D. Convert the 57' min to Arc second 57 × 60 = 3420 Convert the arc second to radians : 1 s = 4.85 × 10⁻⁶ radians 3420 × 4.85 × `10⁻⁶ = 0.016587 Using the formulae : D = R / Ф Where R is the radius of the earth and Ф the arc able in radians. Doing the substitution we have : (6.4 × 10⁻⁶) / (0.016587) = 3.85 × 10^8 |
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