Q.

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?