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Winegar12
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Homework Statement
A 450 g object oscillates from a vertically hanging light spring once every .55 s. The object is released with the spring compressed by 10 cm from the equilibrium position. What is the velocity of the object 3.00 s after it is released?
Homework Equations
v=-[tex]\omega[/tex]Asin([tex]\omega[/tex]t+[tex]\phi[/tex]0)
[tex]\Delta[/tex]L=mg/k
The Attempt at a Solution
Ok so I have found that [tex]\omega[/tex] is equal to 11.4. I tried to figure out k by putting it into the 2nd equation and found that it is equal to .075. I then subtracted that from .1 m (10 cm) which I thought was suppose to give me the A which I found to be .025. Obviously t is 3 s. I thought for [tex]\phi[/tex] it was equal to pi, but apparently I am wrong. Because when I put it into the equation to get velocity the answer is wrong. So I'm pretty sure that I have my angular frequency right, but I am either wrong on my amplitude (A) or on [tex]\phi[/tex]. But I'm not really sure. Can anyone help me out? Thanks!