Answer question 3 and 4 based on 1 and 2

Find a suitable diameter of each of the shafts a,b, and c (in figure of question \#1) if the material of the shafts has a yield stress equal to 60103psi. Make any necessary assumption. Question \#4 For the forces computed in question \#2 and design life of 3000 hours. 1) Compute the design load and 2) Compute the rating load of the bearings. (Take rating life equal to 106 load cycles). The double-reduction helical gearset shown in the figure above is driven through shaft a at a speed of 1200rev/min. Gears 2 and 3 have thotmal ditmetral pitch of 12 teeth/in, a 30 - helix angle, and a normal pressure angle of 20. The second pair of gears in the train, gears 4 and 5 , have a normal diametral pitch of 6 teeth/in, a 25 belix angle, and a normal pressure angle of 20%. The tooth numbers are: N2= 14, N3=54,N4=16,N5=36. Find: (a) The directions of the thrust foree exerted by each gear upon its shaft (b) The speed and direction of shaft c (c) The center distance between shafts Question 42 If the geatser in question itl in to transmit 20HP, a being the input shaft and shaft C being the output shaft a) What is the type or the gear train shown in figure? b) Compute the tangential and radial forees acting on cach of the gears 23