Question

The reading of pressure meter attached with a closed pipe is `3.5 xx 10^(5)Nm^(-2)`. On opening the value of the pipe, the reading of the pressure meter is reduced to `3.0 xx 10^(5) Nm^(-2)`. Calculate the speed of the water flowing in the pipe.
A. `10cm//s`
B. `10m//s`
C. `0.1m//s`
D. `0.1m//s`

Answer 1

Correct Answer - B
`(P_(1))/(rho)+(1)/(2)v_(1)^(2)=(P_(2))/(rho)+(1)/(2)v_(2)^(2)`
`P_(1)-P_(2)=(1)/(2)rho(v_(2)^(2)-v_(1)^(2))(becausev_(1)=0)`