Tension Physics Help: Solve for T with mg/ma Equations

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Homework Help Overview

The problem involves a plank suspended by a cable and pivot, requiring the calculation of tension in the cable using principles of static equilibrium. The context includes parameters such as the length and mass of the plank, the height of the cable attachment, and the position of the center of mass.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need for static equilibrium equations and question their understanding of these concepts. There is an inquiry into the principle of moments and its relevance to the problem.

Discussion Status

The discussion is ongoing, with participants exploring foundational concepts necessary for solving the problem. Some guidance has been offered regarding the need to review course materials related to static equilibrium.

Contextual Notes

There is an indication that the original poster may lack certain foundational knowledge regarding static equilibrium, which could impact their ability to approach the problem effectively.

katiegerster
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Homework Statement



3. A plank of length L=1.800 m and mass M=7.00 kg is suspended horizontally by a thin cable at one end and to a pivot on a wall at the other end.The cable is attached at a height H=1.50 m above the pivot and the plank's CM is located a distance d=0.700 m from the pivot. Calculate the tension in the cable.

Homework Equations



T=mg
T=ma
T-ma=mg

The Attempt at a Solution



how do you solve for tension with the values given? they don't fit into any equations I have..
 
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You need the equations for static equilibrium.
 
what are those?
 
I do not think that you were given the problem without being taught about static equilibrium first. You may want to review your course materials and whatever textbooks assigned. This might be helpful somewhat: http://en.wikipedia.org/wiki/Mechanical_equilibrium
 
Did you learn the principle of moments on your course?
 

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