(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 2.00-kg frictionless block is attached to an ideal spring with force constant 300 N/m. At t=0 the spring is neither stretched nor compressed and the block is moving in the negative direction at 12.0 m/s. Find the amplitude and the phase angle.

2. Relevant equations

x=A*cos(ωt+φ)

v=-ωA*sin(ωt+φ)

[tex]\omega = \sqrt{\frac{k}{m}}[/tex]

3. The attempt at a solution

[tex]\omega = \sqrt{\frac{300}{2.00}} = 12.25[/tex]

[tex]0 = A\cdot cos(\phi)[/tex]

[tex]12.0 = -12.25 \cdot A \cdot sin(\phi)[/tex]

How do I solve for something when there are two unknowns (phi and A)?

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# Homework Help: Simple pendulums

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