A liquid flows through a 2-cm-diameter pipe at a rate of 20 L every minute. Assume a laminar flow and estimate the pressure drop over 20 m of length in the horizontal pipe for
(a) water at 40-C,
(b) SAE-10 oil at 20-C, and
(c) glycerin at 40-C.
Decide if a laminar flow is a reasonable assumption.