Solution: The path motion of a 5 lb particle in the horizontal plane is described in terms of polar coordinates as r=(2t+1) ft and theta=(.05(t^2)-t) rad, where t is in seconds. Determine the magnitude of the resultant force acting on the particle when t=2s.

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The path motion of a 5 lb particle in the horizontal plane is described in terms of polar coordinates as r=(2t+1) ft and theta=(.05(t^2)-t) rad, where t is in seconds. Determine the magnitude of the resultant force acting on the particle when t=2s.