Calculate the critical sped of a lightweight, vertically mounted shaft carrying a rotor of mass 200 g at its mid-point. The stiffness of shaft at the location stiffness is 72000 N/m.

Calculate the critical sped of a lightweight, vertically mounted shaft

1.	Calculate the critical sped of a lightweight, vertically mounted shaft carrying a rotor of mass 200 g at its mid-point. The stiffness of shaft at the location stiffness is 72000 N/m.
A.	360 rad/s
B.	19 rad/s
C.	360000 rad/s
D.	600 rad /s
Answer» E.