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Could someone please help me with this problem?

## Homework Statement

A simple harmonic oscillator takes 11.5s to undergo four complete vibrations.

a. Find the period of its motion

b. Find the frequency in Hertz

c. Find the angular frequency in radians per second

## Homework Equations

ω=2pi(f)

ω=spi/T

f=ω/2pi

t=1/f

## The Attempt at a Solution

a. ω=2pi/11.5=.546

f=.546/2pi=.858

t=1/f=1.166

b. f=.858

c. ω=.546

Thank you very much