- #1

- 29

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U(x) = -a/x+b/x^2

I can solve this problem to find force F(x), stable point, turnning point

but i can't to find the equation of period of the mass for boundaring movement

please help

- Thread starter danai_pa
- Start date

- #1

- 29

- 0

U(x) = -a/x+b/x^2

I can solve this problem to find force F(x), stable point, turnning point

but i can't to find the equation of period of the mass for boundaring movement

please help

- #2

- 238

- 0

How about just using an analogy with the case for a spring:

F(x)=kx, etc.

F(x)=kx, etc.

- #3

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w(omega) = sqrt(k/m) is correct?.Berislav said:How about just using an analogy with the case for a spring:

F(x)=kx, etc.

if correct how can to find values k?. please explain

- #4

- 5,672

- 941

U(x)=(1/2)kx^2 for a spring.

Hopefully, you *know* what force law F(x) corresponds to this potential energy function. How do you get F(x) from U(x)?

What characterizes [in terms of U(x)] the position of the stable equilibrium point?

Given a suitable total energy E (a constant), what is the range of positions available to the particle? If you can setup a differential equation for the conservation of energy, you can obtain an expression for t as a function of E and U(x).

If you can successfully do this for this potential energy function, you should [in principle] be able to apply the same ideas to your potential energy function.

- #5

- 538

- 2

[itex]F= - \frac {dU}{dX}[/itex]

Put above equal to kx and get k , use some math.

BJ

Put above equal to kx and get k , use some math.

BJ

- #6

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- #7

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Did you get an answer to this problem? I don't believe you will need to solve any cubic equations. Do what robphy said...set up the equation

E = (1/2)mv^2 + U(x), where v = dx/dt

and solve for dt. Integrate from one turning point to the other. That's half a period. This gives you the exact period even if the oscillation is not small. If you are allowed to assume the oscillation is small, you can expand the potential energy about a stable point and then apply the F = -kx technique.

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