Question: A shaft has two heavy rotors mound on it The transverse natural frequencies, considering each of the rotor separately, are 100 cycles/sec and 200 cycles/sec

A shaft has two heavy rotors mound on it The transverse natural frequencies, considering each of the rotor separately, are 100 cycles/sec and 200 cycles/sec respectively. The lowest critical speed is

(a) $5367 \mathrm{rpm}$

(b) $6000 \mathrm{rpm}$

(c) $9360 \mathrm{rpm}$

(d) $12000 \mathrm{rpm}$.

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