Strings and Pulleys - Find the energy

AI Thread Summary
The discussion revolves around a physics problem involving three masses connected by strings over frictionless pulleys, focusing on calculating the speed of the lowest mass after it descends 2.0 meters. Participants are encouraged to consider the initial mechanical energy of the system and how it changes over time, using conservation of energy principles. The relationship between the speeds of the masses is emphasized, highlighting the importance of understanding how the taut and inextensible strings affect their motion. The conversation suggests a need for a clear setup of the problem, particularly in defining potential energy levels. This analysis ultimately aims to find the speed of m3 using energy concepts.
parwana
Messages
182
Reaction score
0
p5-32.gif


Three objects with masses m1 = 7.0 kg, m2 = 10.0 kg, and m3 = 14.0 kg, respectively, are attached by strings over frictionless pulleys, as indicated in Figure P5.32. The horizontal surface is frictionless and the system is released from rest. Using energy concepts, find the speed of m3 after it moves down a distance of 2.0 m.
 
Physics news on Phys.org
Interesting problem!
Does it interest you sufficiently to do some work on your own?
 
I don't understand how to set it up.
 
Let for example the floor be the level of zero potential energy.
What is then the mechanical energy of the system initially, and how does that quantity develop over the time?

Since the strings are taut and inextensible, how must the speeds be related to each other?
 
hmm...consider COE
 

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 '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
Using Effective Mass to find the accelerations of 3 masses connected by pulleys
Replies
25
Views
3K
What is the work done on cart by the string?
Replies
1
Views
2K
What Are the Accelerations and Tensions in a Double Atwood's Machine System?
Replies
8
Views
10K
Solve Pulley-Mass System: m1=4.00 kg, m2=1.00 kg
Replies
2
Views
1K
Pulley Problem: Find the acceleration of M2 & M3
Replies
3
Views
2K
Atwood with Sliding mass and real pulley
Replies
4
Views
4K
Calculating tensions and acceleration
Replies
10
Views
2K
Pulley attached to a pulley - Find the balance equation
Replies
11
Views
2K
Force problem with three masses and two pulleys
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top