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

In summary, the problem involves a suspended plank with specific dimensions and mass, attached by a cable at a certain height and distance from a pivot point. The task is to calculate the tension in the cable using equations for static equilibrium, specifically the equations T=mg, T=ma, and T-ma=mg. It is recommended to review course materials and the principle of moments to solve the problem.
  • #1
katiegerster
13
0

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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  • #2
You need the equations for static equilibrium.
 
  • #3
what are those?
 
  • #4
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
 
  • #5
Did you learn the principle of moments on your course?
 

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

What is tension in physics?

Tension in physics is a force that is transmitted through a medium, such as a rope or string, when it is pulled tight. It is a vector quantity, meaning it has both magnitude and direction.

What is the equation for tension in terms of mass and acceleration?

The equation for tension is T = mg + ma, where T is the tension force, m is the mass of the object, g is the acceleration due to gravity, and a is the acceleration of the object.

How do I solve for tension using the mg/ma equations?

To solve for tension using the mg/ma equations, you first need to identify the values of m, g, and a. Then, plug those values into the equation T = mg + ma and solve for T.

What is the difference between tension and weight?

Tension is a force that is transmitted through a medium, while weight is the force of gravity pulling an object towards the center of the Earth. Tension can vary depending on the medium and the direction of the force, while weight remains constant regardless of the medium.

Can tension be negative?

Yes, tension can be negative. This means that the force is pulling in the opposite direction of the intended motion. Negative tension is often seen in situations where an object is slowing down or accelerating in the opposite direction of the applied force.

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