Evaluate the surface integral  F · dS  for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation. F(x, y, z) = yi − xj + 5zk,  S is the hemisphere  x2 + y2 + z2 = 4,   z ≥ 0,  oriented downward

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Evaluate the surface integral 

F · dS

 for the given vector field F and the oriented surface S. In other words, find the flux of F across S. For closed surfaces, use the positive (outward) orientation.

F(x, y, z) = yi − xj + 5zk,
 S is the hemisphere 
x2 + y2 + z2 = 4,
 
z ≥ 0,
 oriented downward
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