Given the parametric equations and , for , find the area enclosed by the curve and the y-axis.
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9. Graphical Applications of Integrals
Area Between Curves
Multiple Choice
Given the region bounded above by and below by for , what are the coordinates of the centroid of the shaded area?
A
B
C
D
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Verified step by step guidance1
Step 1: Understand the problem. The centroid of a region is the 'center of mass' of the area. To find the centroid, we use the formulas for the x-coordinate and y-coordinate of the centroid: x̄ = (1/A) ∫[x * f(x)] dx and ȳ = (1/A) ∫[f(x)/2] dx, where A is the total area of the region.
Step 2: Calculate the area of the region. The region is bounded by y = x^2 and y = 0 for 0 ≤ x ≤ 2. The area A is given by the integral A = ∫[f(x)] dx from x = 0 to x = 2, where f(x) = x^2. Set up the integral A = ∫[x^2] dx from 0 to 2.
Step 3: Find the x-coordinate of the centroid (x̄). Use the formula x̄ = (1/A) ∫[x * f(x)] dx. Substitute f(x) = x^2 into the formula, so x̄ = (1/A) ∫[x * x^2] dx = (1/A) ∫[x^3] dx from 0 to 2.
Step 4: Find the y-coordinate of the centroid (ȳ). Use the formula ȳ = (1/A) ∫[f(x)/2] dx. Substitute f(x) = x^2 into the formula, so ȳ = (1/A) ∫[(x^2)/2] dx = (1/A) ∫[x^2/2] dx from 0 to 2.
Step 5: Evaluate the integrals for A, x̄, and ȳ. First, compute the area A by evaluating ∫[x^2] dx from 0 to 2. Then, compute the integrals for x̄ and ȳ using the formulas derived in steps 3 and 4. Finally, substitute the values of A, x̄, and ȳ into the centroid coordinates (x̄, ȳ).
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