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A lamp hangs vertically from a cord in elevator which is descending with an downward acceleration of a=2m/s2.the tension in the cord T=10.0N . what is the mass m of the lamp?

Asked by Rohan Astik 27th September 2013, 9:47 PM
Answered by Expert
Answer:
The elevator is descending downwards with an acceleration a. The weight of lamp is also in the downward direction. The tension T acts in the vertical direction on the thread with which lamp is hung.
 
Thus, the balance equation of forces on the lamp is:
 
mg - T = ma
mg - ma = T
m(g - a) = T
Thus, m = T/(g - a) = 10/7.8 = 1.28 kg
Answered by Expert 28th September 2013, 3:35 PM
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