Answer
$\frac{\pi}{2}$
Work Step by Step
$$ V = \pi \int_{0}^{1}[{(1)}^2-{(\sqrt{y})}^2]dy$$
$$ V = \pi \int_{0}^{1}[1-y]dy$$
$$ V = \pi [y-\frac{y^2}{2}]_{0}^{1}dx$$
$$ V = \pi[1-\frac{1}{2}]=\frac{\pi}{2}$$
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