A slender shaft supported on two hearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of the same weight but mounted with an eccentricity 2e, critical speed of :he shaft in the second case is:

A slender shaft supported on two hearings at its ends carries a disc w

1.	A slender shaft supported on two hearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of the same weight but mounted with an eccentricity 2e, critical speed of :he shaft in the second case is:
A.	\[\frac{1}{2}N\]
B.	\[\frac{1}{\sqrt{2}}N\]
C.	N
D.	2N
Answer» D. 2N

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