Calculate the net torque using all the forces

Click For 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: 580
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 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

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