<Ch 13 Sect 13.5-13.6 Problem 13.61 At the instant 8 = 60", the boy's center of mass G is momentarily at rest. (Figure 1) Part A Determine his speed when = 85'. The boy has a weight of 90 lb. Neglect his size and the mass of the seat and cords. Express your answer to three significant figures and include the appropriate units. ? OE Å v= Value N O 2 Units Figure < 1 of 1 > Submit Request Answer Part B 10 ft Determine the tension in each of the two supporting cords of the swing when 0 = 85° Express your answer to three significant figures and include the appropriate units. ? CHÅR Value O O Units T = Problem 13.88 < 4 of 5 > II Review Rod O A rotates counterclockwise with a constant angular velocity of 0 = 5 rad/s. The double collar Bis pin-connected together such that one collar slides aver the rotating rod and the other slides over the horizontal curved rod, of which the shape is described by the equation r = 1.5(2-cos) ft. (Figure 1) Part A If both collars weigh 0.65 lb, determine the magnitude of the normal force which the curved rod exerts on one collar at the instant @ = 130 *. Neglect friction Express your answer to three significant figures and include the appropriate units. Figure < 1 of 1 > "HA O 2 ? N = Value Units Submit Request Answer Provide Feedback Next > 6 = 5 rad/ r=1.5 (2 - cose) ft