College physics 2 question

Question

Question

How long does it take electrons to get from

the car battery to the starting motor? Assume

the current is 140 A and the electrons travel

through copper wire with cross sectional area

22.5 mm2 and length 81.7 cm . The mass den-

sity of copper is 8960 kg/m3 and the molar

mass is 63.5 g/mol.

Avogadro’s number is 6.022 × 1023

contributes one conduction electron.

Assume that each copper atom.

Answer in units of min

Answer 1

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