This webpage, from Hyperphysics, describes a pendulum and provides a formula for its period. The page includes a calculator to obtain the period from the pendulum's length and the acceleration of gravity.
This site from the Exploratorium presents a demonstration showing that the acceleration of gravity is the same for different objects. The site contains a materials list, assembly instructions for creating the vacuum,...
These lecture notes discuss Newton's theories of dynamics and gravity. The various kinds of possible orbits are described in this lecture. The evolution of space technology such as rockets, the Space Shuttle, dozens of...
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