Answer
490 N
Work Step by Step
We use the known equations to obtain:
$mg = pA_2$
$mg = p \pi R_2^2$
$mg = \frac{F_1}{\pi R_1^2} \pi R_2^2$
$F_1 = mg (\frac{R_1}{R_2})^2$
$F_1 = (3200)(9.81) (\frac{15}{120})^2=490 \ N$
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