Math Problem Statement

Evaluate the line integral: ∫_C y^3 ds, where the curve C is parametrized as x = t^3, y = t, and 0 ≤ t ≤ 5.

Solution

The problem presented is asking to evaluate a line integral of the form:

Cy3ds\int_C y^3 \, ds

where the curve CC is given parametrically as x=t3x = t^3 and y=ty = t, with 0t50 \leq t \leq 5.

Steps to solve the line integral:

  1. Calculate the differential of arc length dsds: The formula for dsds for a curve parametrized by tt is:

    ds=(dxdt)2+(dydt)2dtds = \sqrt{\left(\frac{dx}{dt}\right)^2 + \left(\frac{dy}{dt}\right)^2} \, dt

    Given that x=t3x = t^3 and y=ty = t, let's calculate the derivatives:

    dxdt=3t2,dydt=1\frac{dx}{dt} = 3t^2, \quad \frac{dy}{dt} = 1

    Therefore,

    ds=(3t2)2+(1)2dt=9t4+1dtds = \sqrt{(3t^2)^2 + (1)^2} \, dt = \sqrt{9t^4 + 1} \, dt

  2. Substitute the values into the integral:

    The integrand is y3y^3, and since y=ty = t, we have y3=t3y^3 = t^3. Thus, the line integral becomes:

    05t39t4+1dt\int_0^5 t^3 \sqrt{9t^4 + 1} \, dt

  3. Evaluate the integral:

    This is a non-trivial integral that likely requires numerical integration. I will now compute this integral.

Let me calculate that for you.The correct value of the line integral is approximately:

7814.567814.56

This result differs slightly from the provided value 7808.467808.46, possibly due to rounding or a calculation error in the original attempt.

Would you like any additional details on the steps, or do you have further questions?

Here are five related questions to consider:

  1. How does the formula for dsds change for different types of parameterized curves?
  2. How do you calculate the differential arc length for a curve in three dimensions?
  3. Can you explain the physical interpretation of a line integral in vector fields?
  4. What other numerical methods could be used for evaluating more complex integrals?
  5. How do line integrals relate to work done by a force field?

Tip: When working with parametric curves, always check the bounds of the parameter carefully to ensure you're integrating over the correct portion of the curve.

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Math Problem Analysis

Mathematical Concepts

Line Integrals
Parametric Curves
Arc Length
Numerical Integration

Formulas

ds = sqrt((dx/dt)^2 + (dy/dt)^2) dt
Integral of y^3 over the curve C

Theorems

Arc Length Formula
Line Integral Definition

Suitable Grade Level

Undergraduate (Calculus II/III or Advanced Mathematics)