Physics · Kinematics
An expanding sphere has a changing radius r, and its mass remains constant during the expansion. The radial speed of any point on the surface of the sphere is directly proportional to its position. If d(lnρ)dt is constant and equal to -3 s-1, and the acceleration a of any point on the surface is given as a = kr, where k is a constant, what is the value of k in s-2?
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