Two masses are attached to opposite sides of a rigid rotating shaft in vertical plane. Another pair of equal mass m1 is attached to the opposite sides of shaft in the vertical plane as shown in figure. Consider m = 1 Kg, e = 50 mm, e1 = 20 mm, b = 0.3 m, a = 2 m and a1 = 2.5 m. For the system to be dynamically balanced m1 should be

Two masses are attached to opposite sides of a rigid rotating shaft in

1.	Two masses are attached to opposite sides of a rigid rotating shaft in vertical plane. Another pair of equal mass m1 is attached to the opposite sides of shaft in the vertical plane as shown in figure. Consider m = 1 Kg, e = 50 mm, e1 = 20 mm, b = 0.3 m, a = 2 m and a1 = 2.5 m. For the system to be dynamically balanced m1 should be
A.	4 kg
B.	2 kg
C.	3 kg
D.	5 kg
Answer» C. 3 kg