- Find the density of 4kg/0.4cm?

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Do trees breez? Need help. Trig? Why does wikipedia say motor's back-EMF is "not due to the motor's inductance but a separate phenomenon", which phenomena? F(x, y) = sin(2y/x) and u is unit vector in direction (1, 2).? Find the maximum rate of change of f(x,y,z) = x + y/z at the point (-2, 3, 2) and the direction in which it occurs.?