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A lamp hangs vertically from a cord in a descending elevator. The elevator has a deceleration of 2.4 m/s 2 before coming to a stop. (a) If the tension in the cord is 89 N, what is the mass of the lamp? (b) What is the tension in the cord when the elevator ascends with an upward acceleration of 2.4 m/s 2 ?
Therefore, the mass of the lamp is 7.28 kg .(b) The tension in the cord when the elevator accelerates upward with a magnitude of 2.4 m/s2 is 89 N, which is the same as it was in the first case because the upward acceleration of the elevator is equal to the deceleration when it is moving downward.
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