A 6.0-kg object oscillates on a spring with a force constant of 160 N/m. The damping coefficient is 0.20 kg/s. The system is driven by a sinusoidal force of maximum value 55 N and the angular frequency is 20 rad/s.
(a) What is the amplitude of the oscillations?
m
(b) If the driving frequency is varied, at what frequency will resonance occur?
rad/s