Physics Dictionary
U
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| ultra-high frequency (UHF) | |
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| ultrasonic wave | |
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| ultra-violet photon | |
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| ultra-violet ray | |
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| umbra | |
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| uniform acceleration | |
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| uniform circular motion | |
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| uniform velocity | |
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| unit | |
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| universal gravitational constant | |
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| unstable equilibrium | |
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| upthrust | |
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| uranium (U) | |
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