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Q.

A water hose 4cm in diameter is used to fill a 30 lit bucket . If it takes 2 minutes to fill the bucket , then the speed V at which the water leaves the hose is

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a

4 cm/s

b

52.6 cm/s

c

70  cm/s

d

19.8  cm /s

answer is D.

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Detailed Solution

Vt=Aυ⇒Vt=πr2υ⇒υ=30×103×72×60×4×22=19.8cms−1
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