(a) The final portion of a beginners ski slope, shown in Fig. 2(a), is to be designed such that a skier's average speed is to remain constant. Tests have indicated that the average coefficients of friction between the skis and the snow are , = 0.1 and =0.08. Answer each of the following. (b) (i) Explain what is meant by 'Coulomb friction'. (4 marks) (ii) What should be the slope angle 0 of the constant speed section? (12 marks) Fig. 2(a) A cantilevered beam is in equilibrium, is subjected to the load combinations shown in Fig. 2(b). Answer each of the following: (i) Sketch the free body diagram for the beam. (4 marks) (ii) Calculate the resultant external reaction force and its direction acting at point A. (7 marks) (iii) Calculate the external moment reaction acting at point A. (3 marks) 3 kN 1.5 m 3.5 m 2.5 m 10 kNm 160 2 m 5 kN 4 kN Fig. 2(b)