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A river has a current with a velocity of 1.5 m/s due east. A boat whose speed in still water is 5 m/s directed north a cross a 100 m wide river. with what speed will the boat cross the river?
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Question: A thin film of MgF_2 (n= 1.38) coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 500 nm and 625 nm. What is the thinnest film for which this can occur ...
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