Why does ##Sigma T. x=0## hold for tension

Kashmir
Messages
466
Reaction score
74
Homework Statement
Found it on internet, couldn't understand why it works
Relevant Equations
$Sigma T. x=0$
1686882109818.png
 
Physics news on Phys.org
Consider the work done on the (ideal) pulleys.
 

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 in a deformed cylindrical bag on a surface
  • · Replies 18 ·
Replies
18
Views
2K
Effect of temperature on surface tension
  • · Replies 2 ·
Replies
2
Views
1K
Problem involving space elevators
  • · Replies 19 ·
Replies
19
Views
2K
Why Is My Bungee Cord Tension Calculation Incorrect?
  • · Replies 15 ·
Replies
15
Views
1K
Tension Force Problem (applying Work-Kinetic Energy Theorem)
  • · Replies 16 ·
Replies
16
Views
1K
Tension in a Two-Crate System on a Frictionless Surface
  • · Replies 7 ·
Replies
7
Views
854
Tension in a string which connects 3 pulleys
  • · Replies 12 ·
Replies
12
Views
1K
What is the Correct Angle for Tension Force in Arm Mechanics?
  • · Replies 2 ·
Replies
2
Views
2K
Combined tensions of an RLC series circuit with AC current
  • · Replies 3 ·
Replies
3
Views
987
Why are tension and friction in the same direction?
  • · Replies 6 ·
Replies
6
Views
3K