13-87. The path of motion of a 5-lb particle in the
Chapter 13, Problem 13-87(choose chapter or problem)
13-87. The path of motion of a 5-lb particle in the horizontal plane is described in terms of polar coordinates as r = (2/ + 1) ft and 0 = (0.5/2 - /) rad, where / is in seconds. Determine the magnitude of the unbalanced force acting on the particle when / = 2 s.
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