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A current of 0.91 A flows through a copper wire 0.45 mm in diameter when it is connected to a potential difference of 15 V. How long is the wire? Express your answer using two significant figures.

Even though I think I'm in the right way, it doesn't accept my answer. A 2.8 balloon is filled with helium ( density = 0.179 ). If the balloon is a sphere with a radius of 5.4 , what is the maximum weight it can lift? Express your answer using two significant figures. I tried to solve it like...