Total tension in cable of the elevator, Mechanical Engineering

Total tension in cable of the elevator:

An elevator having weight 5000N is ascending with an acceleration of 3m/sec2. During this ascent its operator which is having weight 700N is standing on the scale placed on floor. What is scale reading? What will be total tension in cable of the elevator during this motion?

Sol: Given, WE  = 5000N, a = 3m/sec2, WO  = 700N,

Let R = Reaction offered by the floor on operator. This is equal to the reading of scale.

T = total tension in cable

 

1620_Total tension in cable of the elevator.png

Net upward force on operator

= R eaction offered by the floor on operator - Weight of operator

= R - 700

Net force = ma

R - 700 = (700/9.81)X 3

R = 914.28N                                                                      .......ANS

Now for finding total tension in cable, Total weight of elevator is considered.

Net upward force on the elevator and operator

= Total tension in cable - Total weight of elevator and operator

= T - 5700

But net force = mass X acceleration

T - 5700 = (5700/9.81) X 3

T = 7445N                                                         .......ANS

Posted Date: 10/19/2012 9:15:54 AM | Location : United States







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