*biosystems engineering - food science
a newtonian fluid is flowing in a pipeline at a mean velocity of 5 m/s, and this flow rate results in a reynolds number of 17750.
a. what is the maximum velocity in the pipe?
b. if the internal diameter of the pipe is 4.75 cm, when fluid enters the pipe, what is the entrance length required to establish stable flow?

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_