a$.$ Calculate the power input $($W$)$ to a third$-$stage floculation chamber if the velocity gradient is $10$s$^-1.$

b$.$ Calculate the rotational speed $($rpm$)$ of the paddles in a third$-$stage flocculation chamber. Assume that the paddles have a drag coefficient of $1\mathrm{.}5$ and have a velocity relative to the water that is $75\%$ of the rotational velocity.

c$.$ Calculate the Gt product in a third$-$stage flocculator.