Section 10.9: Problem 5 (1 point) A dense particle with mass 5 kg follows the path r(t) = (sin(3t), cos(3t), 21511\") with units in meters and seconds. What force acts on the mass at t = 0? D U. C} kg m/s2 Section 10.9: Problem 8 (1 point) A body of mass 3 kg moves in a (counterclockwise) circular path of radius 8 meters, making one revolution every 5 seconds. You may assume the circle is in the xy- plane, and so you may ignore the third component. A. Compute the centripetal force acting on the body. (DB > B. Compute the magnitude of that force. U Note: Use exact forms or at least 4 signicant digits in your answers. Section 10.9: Problem 4 (1 point) The position function of a particle is given by r(t) = (3152, 2t, t2 815). At what time is the speed minimum