The man pulls on the cord with a force of 350N. Represent this force acting on the support A, as a Cartesian vector and determine its direction

hi liqus here is ur ans;

Explanation:

End points of the cord are A(0m,0m,7.5m)and

B(3m,-2m,1.5 m)

r=(3m-0m)i + (-2m-0m)j + (1.5m-7.5m)k

=(3i-2j-6k)m

Magnitude=length of cord AB

r=(3m)2 +(-2m)2 +(-6m)2 = 7m

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it