a$)$ Calculate the mass flow rate $($in grams per second$)$ of blood $(=1\mathrm{.}0$ g$/$cm$3)$ in an aorta with a cross$-$sectional area of $2\mathrm{.}0$ cm$2$ if the flow speed is $30$ cm$/$s$.$ g$/$s$($b$)$ Assume that the aorta branches to form a large number of capillaries with a combined cross$-$sectional area of $3\mathrm{.}0103$ cm$2.$ What is the flow speed in the capillaries? cm$/$s