Is modulus of derivative of a vector is equal to derivative of modulus of a vector?

The zero vector is both parallel and perpendicular to any other vector. V.0 = 0 means zero vector is perpendicular to V and Vx0 = 0 means zero vector is parallel to V.

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Suppose A is a vector with real components. A can be written as <f(t), g(t), h(t)>. Since the magnitude of A is constant we have f(t)*f(t) + g(t)*g(t) + h(t)*h(t) = c, where c is a non-negative...

We have to be very careful with this one: If two vectors with equal magnitudes point in directions that are 120° apart, then their sum has the same magnitude that each of them has. But vectors are...