Sub: chemical engineering $($fluidization$)$

Caption: $$please answer all sub$-$questions, will upvote for sure$$

You want to fluidize a bed of solid particles using water. The particles are

cubical, with a length on each side of $\frac{1}{8}$ in$.$ and on a SG of $1\mathrm{.}2.$

$($a$)$ What is the sphericity factor for these particles, and what is their equivalent

diameter?

$($b$)$ What is the approximate bed porosity at the point of fluidization of the bed?

$($c$)$ What velocity of water would be required to fluidize the bed?

$($d$)$ What velocity of water would sweep the particles out of the bed?