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Q. A 180 km long high-voltage transmission line 2.0 cm in diameter carries a steady current of 1040 A. If the conductor is copper with a free charge density of 8.8 x102^8 electrons per cubic meter, how long (in years) does it take one electron to travel the full length of the cable?

Q. A sledge loaded with bricks has a total mass of 17.5 kg and is pulled at constant speed by a rope inclined at 21.0° above the horizontal. The sledge moves a distance of 19m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.

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