10 min are taken to empty a rectangular vessel of height h through an orifice in its bottom. How muchtime will it take to be emptied the vessel when half filled?
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a
3 min
b
5 min
c
7 min
d
9 min
answer is C.
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Detailed Solution
Time taken to empty a vessel of height h,t=2h/g∴ Time taken in emptying a vessel of height h/2,t' =2h/2g=hg∴ tt=12or t'=t2=102≈7min
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10 min are taken to empty a rectangular vessel of height h through an orifice in its bottom. How muchtime will it take to be emptied the vessel when half filled?