# Physics - Faucault Pendulum

posted by .

A Foucault pendulum can be used to demonstrate that earth is rotating. Explain how this is possible. What differences would you notice if you used the pendulum at the North Pole, at Earth's equator, and at altitudes between two points?

• Physics - Faucault Pendulum -

You must mean latitudes, not altitudes.

A concise derivation of the equation for the rotation of the plane of oscillation of a Foucault pendulum is hard to find. I once spend a half day in the college library looking for one, reviewing musty leather-bound journals over 150 years old. I finally found one.

It is not hard to convince yourself that the plane of oscillation (referred to ground-fixed coordinates) rotates once every 24 hours at the north and south poles, as the earth rotates below the pendulum. At the equator, the plane remains the same.

At an intermediate latitude A, the plane of oscillation rotates with a period (24 h)/|sin A|. You can think of the ground below as undergoing a combination of translation and rotation. The angle of rotation is determined by "unfolding" a conical surface that is tangent to the Earth as it makes one full rotation below the pendulum.

## Similar Questions

1. ### physics

A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. A Foucault pendulum displayed in a museum is typically quite long, making the effect easier to see. Consider a Foucault pendulum of length 16 m with …

A Foucault pendulum is designed to demonstrate the effect of the Earth's rotation. A Foucault pendulum displayed in a museum is typically quite long, making the effect easier to see. Consider a Foucault pendulum of length 16 m with …
3. ### Physics/Science

Why would someone using a Foucault Pendulum at the equator say that Earth does not rotate?
4. ### Physics

You are at a furniture store and notice that a Grandfather clock has its time regulated by a physical pendulum that consists of a rod with a movable weight on it. When the weight is moved downward, the pendulum slows down; when it …
5. ### physics

Suppose a simple pendulum is used to measure the acceleration due to gravity at various points on the Earth. If g varies by 0.151 % over the various locations where it is sampled, what is the corresponding variation in the period of …
6. ### physics

a pendulum is 0.75 meters long and has a period of 4.17seconds is this pendulum on the earth moon or mars?
7. ### Physics

A large pendulum with a 200-lb gold-plated bob 12 inches in diameter is on display in the lobby of the United Nations building. Assume that the pendulum has a length of 78.4 ft. It is used to show the rotation of the Earth - for this …
8. ### physics

A certain pendulum on Earth has a period of 1.6 s. What would be the period of this pendulum if it were taken to another planet that had 1.75 times the mass of the Earth and 2.5 times the Earth's radius?
9. ### Physics

Hi, I'm stuck with the following question: The acceleration due to gravity on Mars is only 3.75m/s^2. You would like to modify an antique grandfather clock so that it would still keep accurate time on Mars. If the length of the pendulum …
10. ### physics

Pendulum A with mass m and length l has a period of T. If pendulum B has a mass of 2m and a length of 2l, how does the period of pendulum B compare to the period of pendulum A?

More Similar Questions