Question
a.
\(dq=\frac{hγ_w}{4ηL}(R^2-r^2)2πrdr\)
b.
\(dq=\frac{hγ_w}{4ηL}(R^2-r^2)4πrdr\)
c.
\(dq=\frac{hγ_w}{4ηL}(R^2-r^2)8πrdr\)
d.
\(dq=\frac{hγ_w}{4ηL}(R^2-r^2)12πrdr\)
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