Simple quesiton involving Tension of a cable supporting a beam

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SUMMARY

The discussion focuses on calculating the tension in a cable supporting a beam with a weight of 90 kg. The tension throughout the rope is determined using the equation ∑Ma=0, leading to a calculated tension of 933.383 N. The participants clarify that the pivot point chosen simplifies the analysis by eliminating the need to consider reaction forces at point A. The tension is confirmed to be consistent throughout the cable, despite initial confusion regarding the signs in the equation.

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mike41
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Homework Statement



Prob.5-4.jpg

Determine the tension in the cord if the weight is 90kg

The Attempt at a Solution



The tension is the same throughout the rope apparently so;

∑Ma=0
= T(2) - (4/5)T(4) - 882.9N(5.5)
T= 933.383N...

would that be the force in the cable then? i don't have to worry about Ay or Ax because that is my pivot point then right?
 
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Hi mike41! :wink:
mike41 said:
i don't have to worry about Ay or Ax because that is my pivot point then right?
Yes, you choose A as the point to take moments about precisely because you don't want to be bothered with the reaction forces at A. :smile:
The tension is the same throughout the rope apparently so;

∑Ma=0
= T(2) - (4/5)T(4) - 882.9N(5.5)
T= 933.383N...

would that be the force in the cable then?

erm … why is one T minus? :redface:
 

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