Need help - problem Newton laws + my try

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Homework Help Overview

The discussion revolves around a problem related to Newton's laws of motion, specifically involving two masses and their accelerations. Participants are examining the relationships between tension, acceleration, and the distances traveled by the masses.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants are exploring the relationship between the accelerations of two masses and questioning the reasoning behind the acceleration being described as 2a. There is also a focus on the equations derived from the problem and their implications regarding equilibrium.

Discussion Status

Some participants express confidence in their equations, while others question the assumptions regarding the masses and their equilibrium state. There is a mix of attempts to clarify misunderstandings and requests for further guidance on solving the problem.

Contextual Notes

Participants are discussing the setup of the problem, including the specific values of the masses and the angles involved. There is mention of a textbook reference, which may influence the interpretation of the problem.

sedaw
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TNX !

http://img377.imageshack.us/img377/8561/00000qj1.jpg
 
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So t =T1. Why is the acceleration 2a in the second equation?
 
yes T1=t

and m1 distance double m2 distance that`s why the acceleration proportion is 2:1

is that right ?
 
sedaw said:
yes T1=t

and m1 distance double m2 distance that`s why the acceleration proportion is 2:1

is that right ?

No that's not correct where did you get that idea?
 
can you be more specific , what is not correct and how to solve the problem ?

TNX .
 
I don't see anything wrong with your equations. Solve them to find a.
 
Doc Al said:
I don't see anything wrong with your equations. Solve them to find a.

t-m_1gsin30=m_1*2a \ *2
+
m_2g-2t=m_2*a


m_1=m_2 = 5kg


2t - 2t - 2*5*0.5g + 5g= 20a+5a

0=25a ====> ?


the answer in the book is a=2.8

how is that ?



pleasez help .
 
Oops. It looks like the masses are in equilibrium if they are equal. Are you sure you have the masses correct? (Also, what book are you using?)
 
Doc Al said:
Oops. It looks like the masses are in equilibrium if they are equal. Are you sure you have the masses correct? (Also, what book are you using?)

yea i am sure .

the book is classical mechanics by yoram eshel .
 

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