$2.$ Microfluidic systems are enabling lab$-$on$-$a$-$chip applications. What pressure is required to force room$-$temperature water through a $2$ cm long micro$-$fluidic tube with inner diameter of $0\mathrm{.}1$ mm with a flow rate of $0\mathrm{.}1m\frac{L}{m}in?$ How would this required pressure change if the tube diameter is doubled?