177 The pulley-and-weight system shown (called an Atwood Machine) has a solid cylindrical pulley of mass 4 slugs. Masses m, and m2 are 5 slugs and 3 slugs respectively, and R = 0.5 ft. Find: (a) the tension in the cord supporting my, and the tension in the cord R A lugs supporting m2. 0.5 ft (b) the tension in the cord supporting the pulley. Why is this tension not equal to the sum of the tensions in (a)? Why is it not equal to 3 dur the sum of the 3 weights