Tension Calculations for Hanging a Sign at a 30° Angle | Homework Help

In summary, Joe needs to hang a sign weighing 775 N with cable A at a 30.0° angle and cable B horizontal. The sign is in equilibrium, so the sum of the forces in the x and y directions must be zero. Using a free body diagram, equations for the horizontal and vertical components of the forces can be set up, with the tension in the cables being the unknowns. After solving for the tension in cable A, it can be substituted into the equation for cable B to find its tension. After finding the tensions in both cables, Joe can successfully hang the sign.
  • #1
liz155
3
0
Joe wishes to hang a sign weighing 775 N so that cable A attached to the store makes a 30.0° angle, as shown in Figure 7-16. Cable B is horizontal and attached to an adjoining building.

I have no idea where to start. Thanks for any help. :-)

--Cori
 

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  • #2
Draw a Free Body Diagram and then begin with summing the forces in the x and y directions, and possibly taking a moment too.
 
  • #3
Sorry, I still don't understand. Could you maybe explain in more detail? I attached a picture of the diagram in my book if that helps. :-)
 
  • #5
Since the sign is in equilibrium the sum of the components of the forces need to be zero.
Can you set the two equations up for the horizontal and vertical components of the forces? I assume that you need to determine the tensions in the cables.
 
  • #6
What are you solving for specifically? Are you looking for tension in the cables. If so, I believe you can probably start with something like this:

Do you free body diagram and for the equations consider the ones below:

Fx=Fsin(theta)
Fy=Fcos(theta)

I believe since you know the sign is 775N you have a starting point there. You can start with cable A and substitute what you know for A in place of F. You already have Theta (the angle). This should get you going.
 
  • #7
Thanks for all the help everyone! I finally got the answer, and when I checked with my teacher... it was right!

Thanks!
 

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