21. The equation of free vibrations of a system is $$\frac{{{{\text{d}}^2}{\text{x}}}}{{{\text{d}}{{\text{t}}^2}}} + 36{\pi ^2}{\text{x}} = 0{\text{,}}$$ its natural frequency is
22. A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
23. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on
24. The amplitude of vibration is always __________ the radius of the circle.
25. The Bifilar suspension method is used to determine
26. Under logarithmic decrement, the amplitude of successive vibrations are
27. At the nodal point in a shaft, the amplitude for torsional vibration will be
28. In a multiple V-belt drive, if one of the belts is broken, then we should replace
29. The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r1 = Minimum radius of the cam, r2 = Radius of the roller follower and $$\theta $$ = Angle turned by the cam from the beginning of the follower displacement)
30. A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by
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