Rotational Equilibrium Question

Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
2 replies · 2K views
Joshd99

Homework Statement


A bar of uniform density, length L, and mass m is suspended by two ropes of tensions T1 and T2 at either extremity of the bar. The bar is tilted such that it makes an angle θ with the ropes. A mass M is resting at a distance l from T1.
https://i.imgur.com/vLlAJbe.png

If m=17.7kg, M=12.4kg, the angle θ=24.9, and the magnitude T1 is twice as large as T2, what is the distance l in units of L?

Homework Equations


Tnet = 0
Fnet = 0

The Attempt at a Solution


I started off by setting the pivot point at the end of the bar on the side of T1, and therefore the net torque equation should become Mg*l + mg*L/2 - Ft2sinθ*L = 0.

Next I set the net force equation as Ftcosθ + 2*Ftcosθ - mg - Mg = 0

Unsure of how to solve the question as I'm stuck with 2 equations and 3 unknowns L l and Ft
 
on Phys.org
kuruman said:
What is Ft? Just write an expression for the vertical component of the net force and set it equal to zero.

On edit: You're not supposed to find L. The problem is asking you to find ##l## in units of L. That means finding ##l## as some number times L.
thanks for the reply, figured it out with what you mentioned in the edit :)