4. A (blue) platform of mass 1M = 500 kg and length L = 5 m is attached to a wall at its left-end and is supported, Via tension at an angle 6 = 30", by a steel rod on its right-end. Its center-of-mass is located L/3 from the 26 right. There is a hex of mass m = 30 kg located at a distance a, {rem the wall that rests on the platform. x939 . 9/ Wall Jagar x lll 3 M. L |_'_J L I 3 The wall exerts both a rightward and upward force on the left-side of the platform. For all possible values of a: between 0 and L, the system of the box and the platform are in static equilibrium. (25 points) (a) What are the maximum and minimum values for the magnitude of the steel's tension force? (b) What are the maximum and minimum values for the magnitude of the wall's total force on the platform? (0) The steel rod has a crosascctional area of A = 10'3 m2 and a Young's modulus is E = 200 x109 ijz. What are the minimum and maximum values of attain on the steel rod