The figure represents a system composed of pulleys

[leticia beira]

Homework Statement

homework Helper

Relevant Equations

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The figure represents a system composed of two ideal fixed pulleys that support three masses A, B, and C of the same mass M, suspended by light and inextensible threads. Massor A is simultaneously suspended by two wires, one connected to massor B (wire 1) and the other to massor C (wire 2). We can say that the acceleration of massor A will be:
( ) 10/3 m / s² down
( ) 10/3 m / s² upwards
( ) 20/3 m / s² down
( ) 20/3 m / s² upwardshow do i calculate step by step?

 

[leticia beira]

Summary:: the figure represents a system composed of two pulleys, can we say that the acceleration of massor A will be?

A figura representa um sistema composto por duas polias fixas ideais que suportam três massas A, B e C da mesma massa M, suspensas por fios leves e inextensíveis. O massor A é suspenso simultaneamente por dois fios, um conectado ao massor B (fio 1) e outro ao massor C (fio 2). Podemos dizer que a aceleração do massor A será?

Socorro

 

[berkeman]

Homework Statement:: homework Helper
Relevant Equations:: --

The figure represents a system composed of two ideal fixed pulleys that support three masses A, B, and C of the same mass M, suspended by light and inextensible threads. Massor A is simultaneously suspended by two wires, one connected to massor B (wire 1) and the other to massor C (wire 2). We can say that the acceleration of massor A will be:
( ) 10/3 m / s² down
( ) 10/3 m / s² upwards
( ) 20/3 m / s² down
( ) 20/3 m / s² upwardshow do i calculate step by step?

Welcome to the PF.

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Also, you are required to show your efforts to start working the problem before we can offer tutorial help. Please show us your Free Body Diagram(s) and show us how you are trying to work this problem. Thank you.

 

[kuruman]

What figure?

 

[leticia beira]

 

[berkeman]

Summary:: the figure represents a system composed of two pulleys, can we say that the acceleration of massor A will be?

View attachment 264251
A figura representa um sistema composto por duas polias fixas ideais que suportam três massas A, B e C da mesma massa M, suspensas por fios leves e inextensíveis. O massor A é suspenso simultaneamente por dois fios, um conectado ao massor B (fio 1) e outro ao massor C (fio 2). Podemos dizer que a aceleração do massor A será?

Socorro

Yay, you finally got a figure to post. Now show us your Free Body Diagram (FBD) for this system and tell us what you think the answer is.

 

[haruspex]

how do i calculate step by step?

By creating variables to represent the accelerations and tensions and writing equations that relate the acceleration of each object to the forces that act on it.

 

[kuruman]

Also, you need to consider the question, which must be asked when two or more pulleys are present, "is the acceleration the same for all the masses? If the answer is "yes", you need to explain why you think so; if the answer is "no", you need to find how the accelerations differ from each other.

For this question you need to create 3 free body diagrams (FBDs), also called force diagrams, one for each mass. Put in all the forces acting on that particular mass. That is @berkeman's suggestion. Once you have done this, write Newton's second law that is appropriate to each FBD. That is @haruspex's suggestion.