So, I'm trying to brush up on my undergrad physics, and I'm sure this is a bone-headed question, so please bear with me. 1. The problem statement, all variables and given/known data A heavy object, when placed on a rubber pad that is to be used as a shock absorber, compresses the pad by 1cm. If the object is given a vertical tap, it will oscillate. Ignoring the damping, estimate the oscillation frequency. [The book i'm using actually gives the solution] 2. Relevant equations x(t)=A*sin(sqrt(k/m)t+[itex]\phi[/itex]) ω=sqrt(k/m) F=k|l-l0| 3. The attempt at a solution We'll call x0 the equilibrium displacement, x0=1cm k=spring constant of rubber so k(l-l0)=k*x0=mg (equilibrium) gives us k=(mg)/(x0) then ω=sqrt(k/m) which eventually solves to ω=sqrt(g/x0) The book gives an answer of sqrt(980) rad/s. My question is given the units from ω=sqrt(g/x0) (meters, seconds, centimeters), how do they arrive at radians?