HW4 typo error

[Amir-M-Vahedi]

Hello everyone,

I think the requested formula of period for problem one is incorrect.
The requested form is (which is valid for the problem2 that has a pendulum arm):
$P=2\pi\sqrt{\frac{mg+2kr}{2kg}}$
But in the problem1 we have point mass and the formula will become:
$P=2\pi\sqrt{\frac{mg+kr}{kg}}$

In the problem2, the mass in the question is 1kg but in the code it is written as 0.1, which one is correct?

[Amir-M-Vahedi]

I realized the first part of my question is wrong because we have to consider two spring forces.

Does anyone have any idea about the parameters of the problem 2?

[cooperrc]

This period is correct assuming each spring has stiffness $k$,

$P=2\pi\sqrt{\frac{mg+2kr}{2kg}}$

If you consider the total stiffness of the x2 springs as say $k_{eff}$, then
$P=2\pi\sqrt{\frac{mg+k_{eff}r}{k_{eff}g}}$

In the problem2, the mass in the question is 1kg but in the code it is written as 0.1, which one is correct?

$m = 1~kg$ so you can change the code to match,

m = 1 # kg

[Amir-M-Vahedi]

Thanks for your answer.