Two 0.53-kg basketballs, each with a radius of 20cm , are just touching. How muc

Question

Two 0.53-kg basketballs, each with a radius of 20cm , are just touching. How much energy is required to change the separation between the centers of the basketballs to 1.0m ? How much energy is required to change the separation between the centers of the basketballs to 14m? Answer in J. Two 0.53-kg basketballs, each with a radius of 20cm , are just touching. How much energy is required to change the separation between the centers of the basketballs to 1.0m ? How much energy is required to change the separation between the centers of the basketballs to 14m? Answer in J.

Explanation / Answer

del U = GMM (1/ri - 1/rf)

     = 6.67e-11*0.53*0.53 *(1/0.40 - 1/1)

     = 2.81 * 10^-11 J

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%u0394U = GMM (1/ri - 1/rf)

     = 6.67e-11*0.53*0.53 *(1/1 - 1/14)

     =4.55 * 10^-11 J

(the answer of the second part can be also 1.739 * 10^-11 J)

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