Problem 8. A 60 kg person is about to walk a uniform plank. The 45 kg plank rests on two pivots as shown. (a) The person is between the pivots

a distance D from the left end. Determine the normal force exerted by each pivot. Use D = 1.5 m, S = 3.75 m and L = 6 m. (b) The person is now on the far right. How far can he walk past the second pivot (H) before the whole thing tips?