Question

Find the volume of the solid of revolution formed by rotating the bounded region about the x-axis.

Answer 1

Answer:

$40.5 \pi$ cubic units

Step-by-step explanation:

Given is a function exponential as

$f(x) =\sqrt{ (x-4)}$

The region bounded by the above curve, y =0 ,  x =13 is rotated about x axis.

the intersection point is at x=4

The limits for x are 4 and 13

The volume when rotated through x axis is found by

$\pi\int\limits^b_a {f(x)^2} \, dx$

Here a = 4 and b =13

volume = $\pi\int\limits^13_(4) x-4} \, dx$

=$\pi (\frac{x^2 }{2}-4x )\\= \frac{\pi}{2} (153-72)\\= 40.5 \pi$.cubic units