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Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line.y2 = 2x, x = 2y;    about the y-axisV = 768π

Question

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line.y2 = 2x, x = 2y;    about the y-axisV = 768π

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Solution

To find the volume of the solid obtained by rotating the region bounded by the curves y^2 = 2x and x = 2y about the y-axis, we can use the method of cylindrical shells.

The formula for the volume of a solid of revolution using cylindrical shells is V = ∫[a,b] 2πrh dx, where r is the radius of the shell and h is the height of the shell.

Step 1: Solve the equations y^2 = 2x and x = 2y for x to get x = y^2/2 and x = 2y respectively.

Step 2: The region bounded by these curves is a triangle with vertices at (0,0), (0,2), and (2,2). We can see that the radius of the shell is x and the height of the shell is 2y - y^2/2.

Step 3: Substitute these values into the formula for the volume of a solid of revolution to get V = ∫[0,2] 2πx(2y - y^2/2) dx.

Step 4: Evaluate the integral to get V = 768π cubic units.

This problem has been solved

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