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Can somebody solve this problem for me? - 086 - 05-04-2014 04:41 PM
http://postimg.org/image/r6onkhvg7/
- az_lender - 05-04-2014 04:56 PM
I'll call the unknown forces FB, FC, and FD.
[Edit: sorry, had to insert some minus signs!]
FB_z + FC_z + FD_z = 1200N
FB*[h/sqrt(h^2+m^2)] + FC*[h/sqrt(h^2+g^2)] +
+ FD*[h/sqrt(e^2+f^2+h^2)] = 1200 N
Call that Equation 1.
FB_x + FC_x + FD_x = 0
FB*[m/sqrt(h^2+m^2)] + FC*0 +
+ FD*[-e/sqrt(e^2+f^2+h^2)] = 0
Call that Equation 2.
FB_y + FC_y + FD_y = 0
FB*0 + FC*[g/sqrt(g^2+h^2) +
+ FD*[-f/sqrt(e^2+f^2+h^2)] = 0
Call that Equation 3.
Substitute the given numbers e,f,g,h,m
into these three equations, and then use
high-school methods to get a simultaneous solution
for the 3 unknowns (FB, FC, FC).