Question 3 Tooth numbers for the gear train shown in the figure are N2 = 18, N3 = 24, and N4 = 18. Suppose gear 5 is fixed. What is the speed of the arm if shaft a rotates counterclockwise at 250 rev/min? (i) How many teeth must internal gear 5 have? (a) 24 (b) 56 (c) 96 (d) 45 (ii) What is the train value e? (a) 2.546 (b) 1.520 (c) 0.125 (d) 8.236 (iii) Suppose gear 5 is fixed. What is the speed of the arm if shaft a rotates counterclockwise at 250 rev/min? (a) -68.57rev/min (b) -35.71rev/min (c) -12.85 rev/min (d) -48.75 rev/min