Calvin was not satisfied with the results of the last attempt, so he polishes the bottom of their sled with some wax to decrease the coefficient of friction by a factor of 2, causing them to reach the bottom of the jump with a speed of 11 m/s. How far will they fly through the air before landing (assume a horizontal surface even with the top of the jump)?

1:00pm - 3:00pm Please read questions carefully. You must show all steps including all coordinate systems, assumptions, units and free body diagrams where appropriate for full credits. l): A steel shaft carries two concentrated weights in locations 1 and 2 on the shaft as shown in Fig.1. The first weight is 920 Ibs and the second weight is 680 lbs. The steel shaft has a eter of 1.75" and the Young's modules of the material is 29.5 x 108 psi. Neglect the mass of the shaft. (a) Find the shear and bending moment diagrams? (b) Find the static deflections of points 1 and 2 of the steel shaft due to two concentrated weights? (c) Find the first critical speed? (25 points) 1 1.75 ф 92o'b 68o

answer: 31, 5556. 952 seconds

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