Calculating Flux of F across Surface S | Flux Homework Help

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The discussion focuses on calculating the upward flux of the vector field F = across the surface S defined by z = x + y, with constraints 0 ≤ x ≤ 1 and 0 ≤ y ≤ 1. The solution involves parametrizing the surface and computing the cross product of the tangent vectors to obtain the normal vector. The differential area vector is expressed as dS = (-i - j + k)dxdy, which is then integrated with the flux vector to find the total flux across the surface.

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Homework Statement


Let S be the surface z=x+y, 0≤x≤1, 0≤y≤1. Find the upward flux of the vector field F =<z,x,y > across S.


Homework Equations



∫∫SFndS

The Attempt at a Solution


parametrize:
x=x
y=y
z=x+y
rx=<1,0,1> ry=<0,1,1>
 
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kthejohn said:

Homework Statement


Let S be the surface z=x+y, 0≤x≤1, 0≤y≤1. Find the upward flux of the vector field F =<z,x,y > across S.


Homework Equations



∫∫SFndS

The Attempt at a Solution


parametrize:
x=x
y=y
z=x+y
rx=<1,0,1> ry=<0,1,1>
Excellent! Now take the cross product:
\left|\begin{array}{ccc}\vec{i} &amp; \vec{j} &amp; \vec{k} \\ 1 &amp; 0 &amp; 1 \\ 0 &amp; 1 &amp; 1\end{array}\right |= -\vec{i}- \vec{j}+ \vec{k}
where the order of multiplication has been chosen to give positive \vec{k} for upward flow. Now
d\vec{S}= \vec{n} dS= (-\vec{i}- \vec{j}+ \vec{k})dxdy
is the vector differential of surface area. Integrate the dot product of that with the flux vector,
z\vec{i}+ x\vec{j}+ y\vec{k}= (x+ y)\vec{i}+ x\vec{j}+ y\vec{k}.
 

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