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A photometer made by making a grease spot on white paper can be used to compare the brightness of the sun to the brightness of a lamp. By finding a position at which the sun is as bright as the lamp the power output of the sun can be estimated. |
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A spinning rod with a mark near one end is set rotating and spinning at the same time. Amidst the blur of the spinning cylinder, the mark appears three times, forming a stationary triangle. |
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A bob, or mass, hangs from a string attached to the front of the walking men. Watch as the string almost draws the vectors that make the toy work. |
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