Water is flowing downhill in a pipe that is inclined 308 to the horizontal. A mercury manometer is attached to pressure taps 5 cm apart on the pipe. The interface in the downstream manometer leg is 2...

Water is flowing downhill in a pipe that is inclined 308 to the horizontal. A mercury manometer is attached to pressure taps 5 cm apart on the pipe. The interface in the downstream manometer leg is 2 cm higher than the interface in the upstream leg. What is the pressure gradient (P=L) in the pipe in (a) Pa/m, (b) dyn/cm3 , in. (c) H2O/ft, (d) psi/mi?