- #1
PhysicsinCalifornia
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A 20.0 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole. A cable at an angle of 30.0[tex]\circ[/tex] with the beam helps to support the light. Find (a) the tension in the cable and (b) the horizontal and vertical forces exerted on the beam by the pole.
This is what I got so far:
[tex]\sum F_y = T\sin30.0\circ - W = 0[/tex]
[tex]\sum F_y = T(\frac{1}{2}) = 196 N[/tex]
[tex]T = 392 N[/tex]
I'm having trouble with part (b). I know I'm supposed to use [tex]\sum\tau = 0[/tex] but I'm getting stuck because I don't know what to use for the moment arm(if I'm supposed to)
Anything would help, thanks in advance
This is what I got so far:
[tex]\sum F_y = T\sin30.0\circ - W = 0[/tex]
[tex]\sum F_y = T(\frac{1}{2}) = 196 N[/tex]
[tex]T = 392 N[/tex]
I'm having trouble with part (b). I know I'm supposed to use [tex]\sum\tau = 0[/tex] but I'm getting stuck because I don't know what to use for the moment arm(if I'm supposed to)
Anything would help, thanks in advance