The time an object first passes a point in simple harmonic motine

[cyugsi2]

1. The position of a mass oscillating on a spring is given by x=(.078m)cos[2∏t/(.68s)] when is the mass first at the position x=-.078m



x=A cos(2πt/T).



3. the frequency is 1.47. I really don't know were to go from here. can anyone help me?

 

[rock.freak667]

If you substitute x= -0.078 into the equation they gave to you, what variable can you solve for?

 

[cyugsi2]

Never mind I solved the problem I just needed to change my calculator from degree to radiants

 

[cyugsi2]

If you substitute x= -0.078 into the equation they gave to you, what variable can you solve for?

thanks but i just used the inverse cos.

(inverse cos(x/a)) / (2∏/2.4) = t

 

[rock.freak667]

Once you understand why you were solving for 't' in the first place :)