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How long does it take electrons to get from
the car battery to the starting motor? Assume
the current is 141 A and the electrons travel
through copper wire with cross sectional area
42.5 mm? and length 79.3 cm. The mass den-
3
sity of copper is 8960 kg/m³ and the molar
mass is 63.5 g/mol. Avogadro's number is
6.022 x 1028 . Assume that each copper atom
contributes one conduction electron.
Answer in units of min.

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