Problem 13.87 The path of motion of a 8-lb particle in the horizontal plane is described in terms of polar coordinates as r = (3 t + 1)ft and (0.3t2t) rad, where t is in seconds. Part A 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. με ? F= 2.88 lb Submit Previous Answers Request Answer × Incorrect; Try Again; 4 attempts remaining < Return to Assignment Provide Feedback