o produce collagen microthreads, a collagen solution is extruded onto the bottom of a

container containing a buffer solution using a $1$ ml syringe hooked up to a syringe pump.

The extrusion tip at the exit of the syringe is comprised of polyethylene tubing $($size PE $20),$

which has an internal diameter of $0\mathrm{.}38$mm$.$ It is desired to extrude the fibrin at a rate of $5$

cm$/$s$.$a$.$ If a $1$ ml BD plastic syringe $($ID $4\mathrm{.}78$ mm$)$ is used, what is the plunger velocity $($e$.$g$.$ the velocity setting on the syringe pump$)$ needed to accomplish this task? b$.$ If $1$ ml of collagen solution is completely extruded, what is the corresponding length of

collagen microthreads that can be produced?