College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

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The correct equation for the volume of a sphere is V = 4 r 3 /3, where r is the radius of the sphere. Is the equation in Exercise correct If not, what should it be when expressed in terms of d
Exercise
You are told that the volume of a sphere is given by V = d 3 /4, where V is the volume and d is the diameter of the sphere. Is this equation dimensionally correct (Use SI unit analysis to find out.)