Frequency of vibrations is usually expressed in
number of cycles per hour
number of cycles per minute
number of cycles per second
none of these
Answer
The particles of a body move ________ its axis in torsional vibrations.
in a circle about
parallel to
perpendicular to
away from
In a spring-mass system, if the mass is halved and the spring stiffness is doubled, the natural frequency is
halved
doubled
unchanged
quadrupled
In free vibrations, the velocity vector leads the displacement vector by
$$\pi$$
$$\pi/2$$
$$\pi/3$$
$$2\pi/3$$
In free vibrations, the acceleration vector leads the displacement vector by