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5. Let {F}=2 x z \hat{i}-x \hat{j}-y^{2} \hat{k} , evaluate \iiint_{V} {F} d V where V is the region bounded by the surfaces x=0, x=2, y=0, y=6, z=x^{2}, z=4 .

User Mamut
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Answer and Step-by-step explanation:

To evaluate the triple integral \(\iiint_{V} {F} d V\), we need to determine the limits of integration for each variable (x, y, z) based on the given region V.

1. Limits of integration for x:

The region V is bounded by x = 0 and x = 2. Therefore, the limits of integration for x are from 0 to 2.

2. Limits of integration for y:

The region V is bounded by y = 0 and y = 6. Thus, the limits of integration for y are from 0 to 6.

3. Limits of integration for z:

The region V is bounded by z = x^2 and z = 4. As x varies from 0 to 2, the corresponding limits for z are from 0^2 to 2^2, which simplifies to 0 to 4.

Now, we can set up the triple integral:

\(\iiint_{V} {F} d V = \int_{0}^{2} \int_{0}^{6} \int_{0}^{4} (2xz \hat{i} - x \hat{j} - y^2 \hat{k}) \,dz \,dy \,dx\)

To evaluate the integral, we can simplify the integrand by integrating each component separately:

\(\int_{0}^{2} \int_{0}^{6} \int_{0}^{4} 2xz \,dz \,dy \,dx - \int_{0}^{2} \int_{0}^{6} \int_{0}^{4} x \,dz \,dy \,dx - \int_{0}^{2} \int_{0}^{6} \int_{0}^{4} y^2 \,dz \,dy \,dx\)

Integrating each component:

1. \(\int_{0}^{4} 2xz \,dz = xz^2 \Big|_0^4 = 8x\)

2. \(\int_{0}^{4} x \,dz = xz \Big|_0^4 = 4x\)

3. \(\int_{0}^{4} y^2 \,dz = y^2z \Big|_0^4 = 4y^2\)

Substituting the results back into the triple integral:

\(\int_{0}^{2} \int_{0}^{6} \int_{0}^{4} (8x - 4x - 4y^2) \,dz \,dy \,dx\)

Simplifying further:

\(\int_{0}^{2} \int_{0}^{6} (4x - 4y^2) \,dy \,dx\)

Integrating with respect to y:

\(\int_{0}^{2} (4xy - \frac{4}{3}y^3) \Big|_0^6 \,dx = \int_{0}^{2} (24x - 144) \,dx\)

Integrating with respect to x:

\((12x^2 - 144x) \Big|_0^2 = 12(2^2) - 144(2) - (12(0^2) - 144(0)) = -240\)

Therefore, the evaluated value of the triple integral \(\iiint_{V} {F} d V\) is -240.

User Tarek Oraby
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