A lamp hangs vertically from a cord in a descending elevatorthat decelerates at 3.0 m/s2. (a) If the tension in thecord is 53 N, what is the lamp's mass? (b) What is the cord'stension when the elevator ascends with an upward acceleration of3.0 m/s2? i dont know why my anwser are wrong. I got a) 8.41 b) 108 Thank you A lamp hangs vertically from a cord in a descending elevatorthat decelerates at 3.0 m/s2. (a) If the tension in thecord is 53 N, what is the lamp's mass? (b) What is the cord'stension when the elevator ascends with an upward acceleration of3.0 m/s2? i dont know why my anwser are wrong. I got a) 8.41 b) 108 Thank you
Explanation / Answer
When the elevator descending Tension T = m (g-a) = m(9.8 + 3.0 ) therefore mass m = T / 12.8 = 4.14kg when the elevator ascending Tension T = m (g+a) = 4.14 ( 9.8 + 3) = 53 N