Calculate the net torque using all the forces

AI Thread Summary
The discussion focuses on calculating the net torque for a uniform beam supported by a cable and hinge at a 40° angle, with a tension of 600 N. The user initially struggled with the torque equation but realized that in equilibrium, the net torque must equal zero. They correctly identified that the torque due to the weight of the beam (mg) and the tension in the cable must balance out. The final solution involved using the formula mg(l/2)sin(theta) - T*lcos(theta) to find the net torque. The problem is deemed straightforward once the correct approach is applied.
wshope11
Messages
2
Reaction score
0

Homework Statement


In the figure below, a uniform beam of length 12.0 m is supported by a horizontal cable and a hinge at angle θ = 40°. The tension in the cable is 600 N.


Homework Equations



T=F x r

The Attempt at a Solution


I attempted to calculate the net torque using all the forces(mg and tension), so 0=mgsin(40) - Tension.
 

Attachments

  • 12-73.gif
    12-73.gif
    8.2 KB · Views: 569
Physics news on Phys.org
Nevermind got it. Used mg(l of rod/2)sin(theta)-T*lcos(theta)
 
welcome to forum,
that's an easy problem. As the body is equilibrium net torque should be zero.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Tension and net torque in a cable
Replies
10
Views
5K
Effect on net torque and net force on spools
Replies
9
Views
2K
Does distance affect torque in hanging sign problem?
Replies
42
Views
4K
How is net torque zero about hinge of rod in ball rod system
Replies
7
Views
3K
Calculating Net Torque in a Rotating System
Replies
22
Views
3K
Where on a rigid body is a resultant force applied?
Replies
11
Views
1K
Equilibrium of Forces and Torques on Sawhorses Supporting a Person on a Board
Replies
6
Views
2K
Torque and rotational equilibrium question
Replies
6
Views
4K
Frequency & Wavelength of a Vibrating Wire
Replies
5
Views
1K
Torque and Rotational Equilibrium with a slanted Rod/Cable
Replies
7
Views
3K

Hot Threads

Recent Insights

Back
Top