Moments -- Rods & weights welded together & hanging at an angle

  • Thread starter Thread starter nazz
  • Start date Start date
  • Tags Tags
    Angle Moments
AI Thread Summary
The discussion focuses on the equilibrium of two welded rods hanging at an angle, with an emphasis on analyzing the forces and moments involved. The user seeks validation of their force diagram, questioning whether it accurately represents the system's dynamics. A key point raised is that the center of mass of rod BC must be positioned correctly to ensure the overall center of mass of the combined rods is directly below the hinge point A. The conversation highlights the importance of correctly identifying the forces acting on the rods, including gravitational forces and the need for a precise force diagram. Understanding these elements is crucial for determining the angle that rod AB makes with the vertical.
nazz
Messages
8
Reaction score
0
2 uniform roods each or weight W and length L are welded together so that angel ABC is 90, the two rods are hanging in equilibrium from a fixed loin at A by a hinge which allows the rods to swing in a vertical plane. by taking the moments about the hinge find the angle that AB makes with the vertical.

Question is my force diagram correct or what are the forces involved besides weights ?

please have a look at my force diagram, attached image
 

Attachments

  • photo.jpg
    photo.jpg
    25.4 KB · Views: 540
Physics news on Phys.org
Your diagram is drawn as though the centre of mass of rod BC is vertically below A. That will not be the case.
 
so what is right force diagram ?
 
nazz said:
so what is right force diagram ?
Rod AB has a centre of mass to the right of A. Where does the centre of mass of BC need to be for the centre of mass of ABC to be directly below A?
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Thread 'A bead-mass oscillatory system problem'
I can't figure out how to find the velocity of the particle at 37 degrees. Basically the bead moves with velocity towards right let's call it v1. The particle moves with some velocity v2. In frame of the bead, the particle is performing circular motion. So v of particle wrt bead would be perpendicular to the string. But how would I find the velocity of particle in ground frame? I tried using vectors to figure it out and the angle is coming out to be extremely long. One equation is by work...
Back
Top