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Question

Water is flowing continuously from a tap having an internal diameter 8×103m. The water velocity as it leaves the tap is 0.4 ms1. The diameter of the water stream at a distance 2×101m below the tap is close to

A
5×103m
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B
7.5×103m
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C
9.6×103m
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D
3.6×103m
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Solution

The correct option is D 3.6×103m
Diameter=8×103mv1=0.4 m/sv2=v21+2gh=(0.4)2+2×10×0.2=2 m/sA1v1=A2v2π(8×1032)2×0.4=π×d24×2d3.6×103m.

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