(Answered): The bell crank system shown in the figure below is attached to a horizontal spring BC with stiffnes ...

The bell crank system shown in the figure below is attached to a horizontal spring BC with stiffness k = 2 kN/m and a pin support at point A. Spring BC is unstretched when angle 0 = 0°, and the bell crank is in equilibrium under the effect of the external force F when angle 8 = 15°. If spring BC remains in a horizontal position at all times due to the roller at C, determine the following when the crank is in equilibrium: a) The change in length of spring BC when the crank rotates about point A and angle 8 goes from 0° to 15°, and the resulting force in the spring Fs [5 marks] b) The horizontal and vertical support reactions at pin A when angle 8 = 15%. [10 marks) k = 2 kN/ ma CAS roler - 0.0417463M so says 30 300 mm - 400 mm Ex