Simple quesiton involving Tension of a cable supporting a beam

[mike41]

Homework Statement

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?

 

[tiny-tim]

Hi mike41!

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.

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?