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What does the symbol (–hfus) indicate in a phase change?
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Ariver current has a velocity of 5km/h relative to the shore, and a boat moves in the same direction as the current at 5 km/h relative to the river. how can the velocity of the boat relative to the shore be calculated?
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2. Green light has a frequency of 6.10 x 1012 Hz What is the wavelength?...
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