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Physics p4 help m/j 2008 qn 1 (b)

G

gentleman

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i did the following:
d = 0.35
0.72 W = mdω^2
0.72 x 9.81 x m = m x 0.35 x ω^2
ω^2 = (0.72 x 9.81) / (0.35)
ω = √(0.72 x 9.81) / (0.35)
ω = 4.49
now i have a doubt to find (n), the no. of revolutions per minute :) ?
HELP ME =)
 
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