A physics professor has assembled his class at the baggage-claim carousel of the local airport to demonstrate an analog of electrical current. “Think of each suitcase on the conveyor belt as a package of electrons carrying one coulomb of charge,” he says. Counting and timing the suitcases reveals that the conveyor belt represents a wire carrying a constant 2-A current (constant as long as annoyed travelers could be kept away from their baggage by some of the huskier students).

(a) How many suitcases will go by a given point in 5.0 min?

(b) How many electrons does that represent?