hi i u have Problems in Genral Physics by I.E.Irodov then refer pg.63 prb no. 1.321(see the fig) it will give u a good understanding if u still don't understand imagine as if if ur see the fig from the top and draw a top view of the crossection of radius r. i have found the static pressure in the clearence dis-- that's for shure. remember draw a fig. u wilol get a good understanding. if u still have a problem i will help u
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