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diff --git a/896/CH2/EX2.20/20.sce b/896/CH2/EX2.20/20.sce
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+clc
+//calc thickness of liquid strip at the bottom of the industrial centrifuge
+//Let difference between heights at bottom and top be d
+d=20;//in
+r_a=14;//in
+f=1000/60;//rps
+g=32.2;//ft/s^2
+r_b=[(r_a)^2-2*(d)*g*12/(2*(%pi)*f)^2]^0.5;//in
+disp("The thickness of water strip at bottom of industrial centrifuge")
+disp(r_b)
+disp("in")
+\ No newline at end of file