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M4U-9709-IN26-E-VO048 marks

E-VO04 · An unbounded solid with finite volume

For \(b>1\), the region below \(\displaystyle y=\frac2x\), above the x-axis and between \(x=1\) and \(x=b\), is rotated about the x-axis.

Find its volume V(b).

[3]

Find the limiting volume as b tends to infinity.

[2]

Find b so that the part of the limiting volume beyond b is exactly \(\displaystyle \frac\pi5\).

[3]

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