(a) Two gears with a module of 5 mm are mounted at a center distance of 150 mm in a 4:1 ratio reduction gearset. Find the number of teeth in each gear. (5 marks) (b) Figure 1 shows a planetary gear train used in a machine, for which the sun gear is the input and it is driven clockwise at 180 rpm. The ring gear is held stationary by being fastened to the frame. Determine the rotation (i.e. angular velocity and direction) of the arm. (5 marks) 120T 5 Sun gear Arm 60T 2 4 --3-- 40T Planet gear Ring gear Figure 1 (T denotes teeth; Label nos. 2, 3, 4 and 5 represent sun gear, arm, planet gear and ring gear respectively).
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