A vertical shaft of 100 mm diameter and 1 m length has its upper end f – McqOptions

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1.	A vertical shaft of 100 mm diameter and 1 m length has its upper end fixed at the top. The other end carries a disc of 5000 N and the modulus of elasticity of the shaft material is 2 × 105 N/mm2. Neglecting the weight of the shaft, the frequency of the longitudinal vibrations will be nearly
A.	279.5 Hz
B.	266.5 Hz
C.	253.5 Hz
D.	241.5 Hz
Answer» B. 266.5 Hz

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