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update HW4

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rcc02007 committed Feb 21, 2017
1 parent 4a4ee8b commit 9d98bdab973da301d4adb7f60021ce106a43fb0d
Showing with 4 additions and 4 deletions.
  1. +4 −4 HW4/README.md
@@ -11,17 +11,17 @@ heading `# Homework #4` in your `README.md` file

![Collar-mass on an inclined rod](collar_mass.png)

The spring is unstretched when $x_{C}=0.5$. The potential energy due to gravity is:
The spring is unstretched when x_C=0.5 m. The potential energy due to gravity is:

$PE_{g}=m x_{C}g\sin\theta$
PE_g=m x_C*g*sin(theta)

where m=0.5 kg, and g is the acceleration due to gravity,

and the potential energy due to the spring is:

$PE_{s}=1/2K (\Delta L)^{2}$
PE_s=1/2*K *(DL)^2$

where $\Delta L = 0.5 - \sqrt{0.5^{2}+(0.5-x_{C})^{2}}$
where DL = 0.5 - sqrt(0.5^2+(0.5-x_C)^2)

b. Use the `goldmin.m` function to solve for the minimum potential energy at xc when
theta=0. *create an anonymous function with `@(x) collar_potential_energy(x,theta)` in

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