The reading of a pressure meter attached with a closed water pipe is 3.5 x 105 N m-2. On opening the valve of the pipe, the reading of pressure meter is reduced to 3 x 105 N m-2. Calculate the speed of water flowing in the pipe.

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10 cm/s

10 m/s

0.1 m/s

0.1 cm/s

answer is B.

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Detailed Solution

P1r+12v12=P2r+12v22P1−P2=12μv22−v12∵v1=0