Calculating Surface Area and Derivatives

The video tutorial explains how to find the surface area of a surface generated by rotating the curve y = 3x from x = 0 to x = 6 about the x-axis. It introduces the general formula for surface area of revolution and applies it to the specific case of rotation about the x-axis. The tutorial covers the steps to calculate the derivative, set up the integral, and evaluate it to find the surface area, concluding with the approximate surface area value.

What is the curve being rotated to find the surface area?

• y = 3x

• y = x^2

• y = 4x

• y = 2x

Tags

CCSS.HSG.GMD.A.3

CCSS.8.G.C.9

Over which interval is the curve y = 3x considered for rotation?

• x = 0 to x = 4

• x = 2 to x = 6

• x = 0 to x = 6

• x = 1 to x = 5

Tags

CCSS.HSG.GMD.A.3

CCSS.8.G.C.9

What is the axis of rotation for the surface area problem?

• x-axis

• y-axis

• w-axis

• z-axis

What is the general formula used for calculating the surface area of revolution?

• 2π ∫ f(x) dx

• π ∫ [f(x)]^2 dx

• 2π ∫ f(x) √(1 + [f'(x)]^2) dx

• π ∫ f(x) dx

What is the derivative of the function y = 3x raised to the 1/2 power?

• 2 * 3x^(1/2)

• 3/2 * x^(1/2)

• 1/2 * 3x^(-1/2)

• 3x^(1/2)

What is the simplified expression for the square of the derivative?

• 3/(2x)

• 3/(4x)

• 9/(4x)

• 1/(4x)

What substitution is used to simplify the integral for surface area?

• T-substitution

• V-substitution

• W-substitution

• U-substitution

What is the expression for U in the U-substitution?

• U = x + 3/2

• U = x + 1/4

• U = x + 3/4

• U = x + 3/4x

What is the approximate surface area obtained from the calculation?

• 200.5678 square units

• 150.1234 square units

• 100.0000 square units

• 122.5221 square units

What is the final step in calculating the surface area?

• Evaluating the integral using a calculator

• Simplifying the expression

• Setting up the integral

• Finding the derivative