Frequency of Undamped, Forced Oscillation with Negligible Damping

[K3nt70]

[SOLVED] Undamped, Forced Oscillation

Homework Statement

Damping is negligible for a 0.133 kg mass hanging from a light 6.80 N/m spring. The system is driven by a force oscillating with an amplitude of 1.34 N. At what frequency will the force make the mass vibrate with an amplitude of 0.445 m? There are two possible solutions, enter one of them.

Homework Equations

A=(F/m)/(sqrt(((w^2 - Wo^2)^2) + (bw/m)^2))
wo= sqrt(k/m)

The Attempt at a Solution

i filled in the equation, solved for w and got 8.63 Hz, but its wrong. A point in the right direction would do wonders.Cheers

 

[Redbelly98]

Did you get 8.63 Hz or 8.63 rad/sec?

 

[K3nt70]

the answer was rad/sec. i solved for w but put it in as the frequency. all i needed was a little nudge in the right direction. Thanks for your help!