Question Details

A parabola x = y2 with 0 ≤ x ≤ 1 is shown in the figure. The volume of the solid of rotation obtained by rotating the shaded area by 360° around the x–axis is

Options

A

π/4

B

π/2

C

π

D

Show Answer

Correct Answer :

Option B

π/2

π/2

Solution :

The correct option is π/2.

To find the volume of the solid of rotation obtained by rotating the shaded area 360° around the x-axis, we use the disk method.

The boundary curve is given by the parabola equation:
x=y2
for the interval:
0x1

The formula for the volume V of a solid rotated about the x-axis is given by:
V=abπy2dx

Here, the limits of integration along the x-axis are from a=0 to b=1, as visible in the provided figure. Substituting these limits and the relation y2=x into the volume formula, we get:
V=01πxdx

Now, we integrate with respect to x:
V=πx2201

Evaluating the expression by substituting the upper limit 1 and the lower limit 0:
V=π122-022
V=π12-0=π2

Therefore, the volume of the solid of rotation is π2.

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