Elevator Physics - Boston University
Your free-body diagram has two forces, the force of gravity and the upward normal force from the elevator. The elevator's free-body diagram has three forces, the force of gravity, a downward normal force from you, and an upward force from the tension in the cable holding the elevator.
AC Circuits - Boston University
AC Circuits. 7-23-99 Alternating current. Direct current (DC) circuits involve current flowing in one direction. In alternating current (AC) circuits, instead of a constant voltage supplied by a battery, the voltage oscillates in a sine wave pattern, varying with time as:
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It has been an interesting, rewarding & enjoyable 49 years in the auction business. Auction sales have evolved from the very simple cash only, name only experience to bidder registration, computer involvement, ever larger auctions, e-transfers & now online auctions.