9. Graphical Applications of Integrals

Area functions for the same linear function Let ƒ(t) = 2t ― 2 and consider the two area functions A (𝓍) = ∫₁ˣ ƒ(t) dt and F(𝓍) = ∫₄ˣ ƒ(t) dt .

(a) Evaluate A (2) and A (3). Then use geometry to find an expression for A (𝓍) , for 𝓍 ≥ 1 .

A power line is attached at the same height to two utility poles that are separated by a distance of 100 ft; the power line follows the curve ƒ(x) = a cosh x/a. Use the following steps to find the value of a that produces a sag of 10 ft midway between the poles. Use a coordinate system that places the poles at x = ±50.

a. Show that a satisfies the equation cosh 50/a − 1 = 10/a.

Area of regions Compute the area of the region bounded by the graph of ƒ and the 𝓍-axis on the given interval. You may find it useful to sketch the region.                                              

 ƒ(𝓍) = 2 sin 𝓍/4 on [0, 2π]

Length of a curve

Find the length of the curve

y = ∫(from 1 to x) sqrt(sqrt(t) - 1) dt, where 1 ≤ x ≤ 16.

Given the curves $y=x^2$ and $y=4$, find the area of the region bounded by these curves between $x=-2$ and $x=2$.

What is the area of the region enclosed by the curves $y={\sec }^2\left(x\right)$ and $y=8\cos \left(x\right)$ for $-\frac{\pi }{3}\le x\le \frac{\pi }{3}$?

Which of the following integrals correctly represents the area of the region enclosed by the curves $y=4x$, $y=16x$, and $y=\frac{1}{16}x$ for $x>0$?

Determine the area of the shaded region in the following figures.

Find the areas between the curves y=2(log_2(x))/x and y=2(log_4(x))/x and the x-axis from x=1 to x=e. What is the ratio of the larger area to the smaller?

In Exercises 11–14, find the total area of the region between the graph of f and the x-axis.

ƒ(x) = 5 - 5x²/³, -1 ≤ x ≤ 8

Find the area of the region described in the following exercises.

The region bounded by y=e^x, y=e^−2x, and x=ln 4

b. Find the center of mass if, instead of being constant, the density function is δ(x)=4/√x.

Find the area of the region described in the following exercises.

The region bounded by y=2−|x|and y=x^2

Find the lengths of the curves in Exercises 19–22.

y = (5/12) x⁶/⁵ ― (5/8)x⁴/⁵ , 1 ≤ x ≤ 32

Functions from arc length What differentiable functions have an arc length on the interval [a, b] given by the following integrals? Note that the answers are not unique. Give a family of functions that satisfy the conditions.

a. ∫a^b √1+16x⁴ dx