Why is the upward flux of a vertical vector field F = (0, 0, 1) across a

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Why is the upward flux of a vertical vector field F = (0, 0, 1) across a surface equal to the area of the projection of the surface in the xy-plane?

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Calculus For Scientists And Engineers Early Transcendentals

ISBN: 9780321849212

1st Edition

Authors: William L Briggs, Bernard Gillett, Bill L Briggs, Lyle Cochran

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