Recent content by ViralRiver

Bumping this as I'm stuck on this same question. I got my final answer to be 5.34m, but as said before, this is not the same as the book. Is my answer correct?

Hmm, I just realized. I haven't added in the horizontal components, it should be an irregular pentagon.

I didn't understand that completely. Don't worry as I'll re-read it tomorrow morning when I'm fully conscious and see what I can do :P .

http://www.grabup.com/uploads/4200271909D120091B00DB18F155.png That's a quick sketch. Although now that I think about it, they are vectors so I have obviously added them wrong. Regardless, two of the angles have to be 30 degrees and that alone tells me that not all sides have a length of 10CM /...

Ahh that makes more sense now. So the maths version is correct, but now I need to work out the drawing, which is harder than I thought. Using a scale of 1CM - 2N, I drew one line straight down 10CM to represent Fg. I then drew on the other 2 lines with 30 degrees interior angles, and well the...

Argh, I've just been told by someone that T1 and T2 are not both equal to 20N. What have I done wrong?

It must be exactly to scale. I've been going through my notes again (after writing up the maths method (twice xD). I've found out that if the system is in equilibrium, drawing the component vectors should assemble a closed polygon. If it does not form a closed polygon, it is not in equilibrium...

Thanks, so using maths I have worked out that T1 and T2 are both equal to 20N. So, now I need to tackle part b. Am I right in thinking I'll be drawing the sides of the triangles out as vectors, hoping for them to make a closed polygon?

SO: sin30 = 10/T2 T2sin30 = 10 T2 = 10/sin30 T2 = 20 Or have I rearranged it incorrectly?

Ok, from what I now know: http://www.grabup.com/uploads/1800261909D120091B17DB04F125.png And T1 = T2. Before I carry on, just want to make sure this is correct. As T1y is equal to T2y, they must each be half of Fg - "10".

Sorry, that was actually supposed to say T1x and T2X must be equal length. Is that right? What is T2s, Fy and Fg?

Ahh, and because T1 is equal to T2, and the angles which meet the origin are both 30 degrees, T1x and T1y must be equal length. As T2x is in the negative x direction, and T1x is in the positive x direction, they cancel each other out, only leaving the y components. So, T2y + T1y must be equal...

Ok, I now understand why T1 has to be equal to T2 (but I wouldn't know how to work this out if the angles were different). I know about vectors, adding vectors, and SOHCAHTOA. Before I try out what you have asked (about T1x and T2x) I want to make something else clear. T1x + T1y + T2x + T2y...

According to wikipedia: Equilibrium is the condition of a system in which competing influences are balanced I understand that completely. For my diagram to be in equilibrium, there needs to be a force of 20N above the horizontal line, correct? If so, does T1 + T2 have to add up to 20N?

Sorry, if this takes a while for me to understand, but I want to make sure I know this 100%. Starting from the top, the title on the worksheet is "Equilibrium" therefore I am pretty sure that it is in equilibrium. Can you explain a bit more on why T1 = T2?