Calculating Tension in a Pulley System with Three Masses

AI Thread Summary
To determine the conditions for mass M3 to descend in a pulley system with three masses, the inequality M3g > T must hold true. The user proposed that tension T can be calculated as T = (M1g + 0.5M2g + M3g)/3, leading to the conclusion that 2M3 > M1 + 0.5M2. However, there is uncertainty about the accuracy of this tension calculation. Clarification on the correct approach to find the tension in the rope is needed to solve the problem fully. Understanding the correct tension formula is crucial for addressing the other parts of the question.
Anza Power
Messages
10
Reaction score
0
We have the following system in ideal condition (pulleys and rope are mass-less and frictionless)

295a8hz.png


We need to find the conditions in which M3 will go downwards...

Ok so here's what I did:

M3g > T

And this is what I'm not sure of:
T=(M1g + 0.5M2g + M3g)/3

So the answer which I came to was:

2M3 > M1 + 0.5M2

But I'm a bit unsure, did I go wrong? how do I approach this question and how do I calculate the tension in the rope?
 
Physics news on Phys.org
I am sorry to bump this but can someone just tell me if the tension calculation is right? I just need to know how to find the tension and I can solve everything (there are other parts in this question)
 

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

Newton's Second Law (Pulley Sustem)
Replies
3
Views
2K
Problem with pulleys - two fixed and one movable
Replies
22
Views
307
System of two pulleys and three masses
Replies
22
Views
6K
Ideal Vs Real Mass Pulley system
Replies
10
Views
5K
Olympiad dynamics problem with 3 masses and a pulley
Replies
17
Views
2K
Accelerating pulleys (3 pulleys and 3 masses)
Replies
5
Views
2K
Pulley system problem: 6 Pulleys and 1 Mass
Replies
5
Views
857
Leg suspended in a traction system
Replies
18
Views
5K
Tension Question with One Mass and Two Pulleys
Replies
7
Views
1K
3 pulley problem with attached masses
Replies
15
Views
5K

Hot Threads

Recent Insights

Back
Top