(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The cable AB keeps the 8-kg collar A in place on the smooth bar CD. The y axis points upward. Determine the distance s from C to the collar A for which the tension in the cable is 150N.

location of:

B: (0m, 0.5m, 0.15m)

C: (0.4m, 0.3m, 0m)

D: (0.2m, 0m, 0.25m)

collar A's location is unknown. The required is the distance between C and collar A. The answer is 0.305m, but I need the solution for it.

For an easier look, http://img86.imageshack.us/img86/4710/392ij8.jpg" [Broken]

Someone answered this in yahoo answers. Can someone verify it?

http://answers.yahoo.com/question/index;_ylt=AgV3Ti6P9WnWMOA1BU8rsIDzy6IX?qid=20061225063557AANnWr1"

2. Relevant equations

edc= dc/|dc|

W=mg

edc=eac

s=distance between A and C

3. The attempt at a solution

DC=0.2i+0.3j-0.25k

edc=0.4558i-0.6838j+0.5698k

I'm not sure about this part...

eab= -Axi+(0.5-Ay)j+(0.15-Az)k

sqrt(Ax^2+Ay^2+Az^2-Ay-0.3Az+0.2725)

eac= (0.4-Ax)i+(0.3-Ay)j-Azk

sqrt(Ax^2+Ay^2+Az^2-0.8Ax-0.6Ay+0.25)

sedci=-150eabi

sedcj=-150eabj

sedck=-150eabk

eabi=-Axi/|AB|

eabj=(0.5-Ay)j/|AB|

eabk=(0.15-Az)k/|AB|

I equated the "s" in the previous part and got...

Ay=0.5-1.5Ax

Az=1.25Ax+0.15

After that, my solutions just go in circles. I couldn't get what Ax is.

Also, Is my use of Ax, Ay, Az correct? I'm doubting about it.

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# Homework Help: Need help in Unit Vectors

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