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Q. Air "breaks down" when the electric field strength reaches 3.1×106 {rm{ N/C}}, causing a spark. A parallel-plate capacitor is made from two 3.0 {rm cm}-diameter disks. How many electrons must be transferred from one disk to the other to create a spark between the disks?

Q. A 5.0 kg rock is dropped from rest down a vertical mine shaft. How long does it take for the rock to reach a depth of 79 m? Neglect air resistance.

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