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Pivot Problem

  • Thread starter DrunkApple
  • Start date
  • #1
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Static Equilibrium Problem

Homework Statement


A uniform bar of length 16 m and mass 8 kg is
attached to a wall with a hinge that exerts a
horizontal force Hx and a vertical force Hy on
the bar. The bar is held by a cord that makes
a 90 degree angle with respect to the bar and 45 degree
with respect to the wall.
What is the magnitude of the horizontal
force Hx on the pivot? The acceleration of
gravity is 9.8 m/s2 .
Answer in units of N

Homework Equations



The Attempt at a Solution


I actually have no idea what I'm doing in this question. This chapter I do not get.
 

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Answers and Replies

  • #2
Spinnor
Gold Member
2,123
318
It takes time, try studying worked out examples.
 

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  • #3
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0
for Hx, why isn't x component of the rod included?
 
  • #4
Spinnor
Gold Member
2,123
318
There are only two forces in the x direction that act on the bar, a piece of T and the force acting on the bar at the pivot I labeled F_x.

Good luck.
 
  • #5
111
0
Yes yes but i dont understand why x component of Fg is left out though
 
  • #6
Spinnor
Gold Member
2,123
318
What is Fg? Is that mg? If so mg acts in the y direction.
 
  • #7
111
0
I got it. I got confused with this Fg cuz the rod was slanted and somehow mistaken it that the rod was on the incline -_- thank u mate :)
 

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