Question: 1 0 . 1 . Suppose that an experimentally observed frictional force is approximated by Ff = a ( dx / dt ) 3 ,

10.1. Suppose that an experimentally observed frictional force is approximated by Ff = a(dx/dt)3, where a is a constant. (a) What is the sign of a?(b) What is the dimension of a?(c) Show that the resulting differential equation is nonlinear.

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