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If earth be at one half …

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If earth be at one half of its present distance from the sun, how many days will there be in a year?

    • Posted by Mohammed Anoosh Asharaf 5 years ago

    CBSE > Class 11 > Physics
    • 1 answers

    Yogita Ingle 5 years ago

    By Keplers laws of planetary motion, we know that T2  is proportional to R3

     Hence, T12 / R13  = T22 / R23  

     (T2 / T1 )2 = (R2  / R1 )3

     By the given problem, R2 is half of R1 R2 = R1/ 2

    Hence,

     (T2 / T1 )2 = (R1/ 2 R1 )3 = 1/8

    Substituting T1 as 1 year

    T22  = 1/8 (1)2  = 1/8 (365 days)2

    T2  =129days

    2Thank You

    ANSWER
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