- #1

LCSphysicist

- 646

- 162

- Homework Statement
- A non-deformed spring whose ends are fixed has a stiffness

x = 13 N/m. A small body of mass m = 25 g is attached at the point

removed from one of the ends by n = 1/3 of the spring's length. Neg-

lecting the mass of the spring, find the period of small longitudinal

oscillations of the body. The force of gravity is assumed to be absent.

- Relevant Equations
- All below.

I am not sure if i get the problem, but if i understand, we want to know the period of oscillations on a spring with length l/3.

If is this the right interpretation, i would say that the stiffness of the new the spring is k/n, where k is the stiffness of the former spring.

This based on the knowing that the displacement of the points of the spring is proportional to the distance of the end, so to one force :

f = f, kx = k'xn, k' = k/n

T = 2π√(n*m/k)

The answer is, actually

T = 2π√(n*(1-n)m/k)

Where am i wrong?

If is this the right interpretation, i would say that the stiffness of the new the spring is k/n, where k is the stiffness of the former spring.

This based on the knowing that the displacement of the points of the spring is proportional to the distance of the end, so to one force :

f = f, kx = k'xn, k' = k/n

T = 2π√(n*m/k)

The answer is, actually

T = 2π√(n*(1-n)m/k)

Where am i wrong?

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