A visitor to a lighthouse wishes to determine the height of the tower. She ties a spool of thread to a small rock to make a simple pendulum, which she hangs down the center of a spiral staircase of the tower. The period of oscillation is 10.1 s. The acceleration of gravity is 9.8 m/s 2 . What is the height of the tower?

Respuesta :

To solve this problem we must rely on the equations of the simple harmonic movement that define the period as a function of length and gravity as

[tex]T = 2\pi \sqrt{\frac{l}{g}}[/tex]

Where

l = Length

g = Gravity

Re-arrange to find L,

[tex]L = g (\frac{T}{2\pi})^2[/tex]

Our values are given as

[tex]g = 9.81m/s[/tex]

[tex]T = 10.1s[/tex]

Replacing,

[tex]L = g (\frac{T}{2\pi})^2[/tex]

[tex]L = (9.81) (\frac{10.1}{2\pi})^2[/tex]

[tex]L = 25.348m[/tex]

Therefore the height would be 25.348m

The height of the tower is 2.51 m

Simple pendulum:

The angular velocity of oscillation of the simple pendulum is :

[tex]\omega=\sqrt{\frac{g}{l}}[/tex]

We know that the time period is given by:

T = 2π/ω

So, the time period of oscillation of a simple pendulum is given by:

[tex]T = 2\pi\sqrt{\frac{l}{g}[/tex]

where, l is the length of the string, which is equal to the height of the tower.

It is given that the time period is T = 10.1 s.

So,

[tex]T = 2\pi\sqrt{\frac{l}{g}}\\\\l=\frac{Tg}{4\pi^2}\\\\l=\frac{10.1\times9.8}{4\pi^2}\\\\l=2.51\;m[/tex]

The height of the tower is 2.51 m.

Learn more about simple pendulum:

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