Earth reflects light from Sun into Space; are there any "mirror like" objects which reflect back to Earth this light? Has anyone been able to use this method to recover some information on how was the Earth in the past (how it looked, what was it temperature, etc)?
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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?
I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...
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I have performed experiments in my college laboratory on Newton's rings to find radius the of curvature of the convex lens used. I alway...
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I was solving the sample problems for my school's IQ society and there are some I don't get. Since all I get is a final score, I wan...
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500 are at my end, 500 are at my start, but at my heart there are only 5. The first letter and the first number make me complete: Some consi...
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