- #1
bob tran
- 17
- 0
Homework Statement
A 0.50-kg object is attached to an ideal massless spring of spring constant 20 N/m along a horizontal, frictionless surface. The object oscillates in simple harmonic motion and has a speed of 1.5 m/s at the equilibrium position.
(a) What is the amplitude of vibration?
(b) At what location are the kinetic energy and the potential energy of the system the same?
Correct Answer: a) 0.24 m, b) 0.17 m
I'm not sure how part A is different from part B.
Homework Equations
Part A:
[tex]
\dfrac{1}{2}mv^2=\dfrac{1}{2}kA^2\\
\dfrac{1}{2}mv^2=\dfrac{1}{2}kx^2
[/tex]
The Attempt at a Solution
Part A:
[tex]
\dfrac{1}{2}mv^2=\dfrac{1}{2}kA^2\\
A=\sqrt{\dfrac{mv^2}{k}}\\
A=\sqrt{\dfrac{(.5)(1.5)^2}{20}}=0.24 \ \texttt{m}
[/tex]
Part B:
Same thing..?
[tex]
\dfrac{1}{2}mv^2=\dfrac{1}{2}kx^2\\
x=\sqrt{\dfrac{mv^2}{k}}\\
x=\sqrt{\dfrac{(.5)(1.5)^2}{20}}=0.24 \ \texttt{m}
[/tex]