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- Pre-experimental science (6447 bytes)
8: ...[movement]] hypothesized that [[friction]] was an omni-present phenomenon - that any body in [[motion]] ...
15: ... inherent property of objects; friction ''seems'' omni-present because we live in an environment filled ...
19: ...light. It was translated into [[Latin]] around [[1270]], which brought this knowledge to Western Euro... - Radar (16746 bytes)
2: [[Image:Radar antenna.jpg|right|thumbnail|250px|This long range radar [[antenna (electronics)...
28: <math>Range = \frac{c\tau}{2}</math> where c is the speed of light in a vacuum...
53: Early systems tended to use [[omni-directional broadcast]] antennas, with directiona...
60: ...arge antenna, such a system has a number of small omni-directional antennas referred to as ''elements'',...
73: ... = {{P_t G_t A_r \sigma}\over{{(4\pi)}^2 R_t^2R_r^2}}</math>
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