Question
Thu December 01, 2011 By: Abhinav Rastogi

At what height from the surface of the earth will the value of g be reduced by 40 percent from itÂ’s value at the surface?

Expert Reply
Thu December 01, 2011
when g reduces by 40% , it becomes=3g/5
      take this is the value of g at ht   h.
the relation of g with h is:
value of   g at  ht  h=g(1-2h/R)                       R= radius of earth
so   ,      3g/5=g-2gh/R
              h=R/5
 
 
so at R/5 height from the surface of the earth, value of g will reduce by 40%.
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