Determine the magnitude of the unbalanced force acting on the particle when t = 3 s. Express your answer to three significant figures and include the appropriate units.
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The path of motion of a 7-lblb particle in the horizontal plane is described in terms of polar coordinates as rr = (2 tt ++ 1)ftft and θθ = (0.5 t2t2 −− tt) radrad, where tt is in seconds.
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