Verify Stoke’s theorem for the vector
[b]A[/b]=(2x-y)[b]i[/b]-yz[sup]2[/sup][b]j[/b]-y[sup]2[/sup]z[b]k[/b],
& where S is the upper half surface of the sphere x[sup]2[/sup] + y[sup]2[/sup] + z[sup]2[/sup] = 1 and C is its boundary
Given the coordinate transformation
u[sub]1[/sub] = xy
2u[sub]2[/sub] = x[sup]2[/sup] + y[sup]2[/sup]
u[sub]3[/sub] = z,
Determine if the coordinate system is orthogonal.