Galileo and his swinging pendulum

British physicist and army captain Henry Kater in realized that Huygens' principle could be used to find the length of a simple pendulum with the same period as a real pendulum. The mass of the pendulum bob? A more important cause of this reduction in g at the equator is because the equator is spinning at one revolution per day, reducing the gravitational force there. The presence of the acceleration of gravity g in the periodicity equation 1 for a pendulum means that the local gravitational acceleration of the Earth can be calculated from the period of a pendulum. Visit our multimedia page for video about recent projects and interviews with HUP authors. Then putting this period and the distance between the pivots into equation 1 gives the gravitational acceleration g very accurately. Its History and Culture.
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The Galileo Project | Science | Pendulum Clock

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Simple Pendulum

The Overlook Press, If these variations in the escapement's force cause changes in the pendulum's width of swing amplitude , this will cause corresponding slight changes in the period, since as discussed at top a pendulum with a finite swing is not quite isochronous. They are then swung with different amplitudes. The idea was that anyone, anywhere on Earth, could recreate the standard by constructing a pendulum that swung with the defined period and measuring its length.
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Galileo's contribution to clock making

Biographical Dictionary of the History of Technology. A pendulum in which the rod is not vertical but almost horizontal was used in early seismometers for measuring earth tremors. Note that the angular amplitude does not appear in the expression for the period. Picard then mentions that temperature slightly effects the length of this pendulum: If left alone, the pendulum will sit so that its string is perfectly vertical; that position is called equilibrium , which is the position at which the forces acting on the bob are perfectly balanced.
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Einstein called this the equivalence principle , and when you carry the idea to its logical extreme, it leads to his general theory of relativity. The size of the arc? The back and forth motion of a heavy body suspended from a rope was therefore not a phenomenon that could explain or illustrate much. Let alone about the deepest recesses of the universe. Machines made to do no job other than to show some example of such smooth and regular change, which we then checked against and compared to other motion around us; and the first motion we compared our clocks to would be the apparently repetitive motion of the sun. For those unafraid of the math, the relationship is a square root:
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