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OpenStudy (anonymous):
Can anyone help me with this Mechanics question please? I've been stuck on it for ages now. Suppose that A and B are points on the diameter of a sphere with centre 0. If P is another point on the sphere, show that vector(AP) and vector(BP) are orthogonal. Hint: Show that (p - a) . (p + a) = 0, where p = vector(0P) and a = vector(0A).
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