Static Equilibrium-Balancing Forces and Torque

AI Thread Summary
The discussion centers on a physics problem involving torque and static equilibrium on a teeter-totter with two children of different masses. The key equation for torque is T = r x F sin(theta), where r is the distance from the pivot, F is the force due to weight, and theta is the angle. A participant expresses confusion about the 1.0 m distance used in a sample calculation for torque, questioning its origin. Additionally, there is a concern that the problem lacks sufficient details, specifically regarding the position of the lighter child, which complicates finding a definitive solution. Clarifying these aspects is essential for accurately solving the problem.
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Homework Statement


Two children of masses 45 kg and 30 kg are playing on a teeter-totter of length 4.0m and mass 30.0kg, pivoted at its centre. The heavier child sits 1.75 m from the centre of the teeter-totter that is 0.50 m from the ground. a) What torque does the teeter-totter apply to each of its sides? With this knowledge, how could you simplify any further calculations.

Homework Equations



T=r x Fsin(theta)

The Attempt at a Solution


The example says:
T=rF sin (theta)
T=(1.0 m)(30.0 kg)(9.8 N/kg)
t-t  147 N·m

I don't understand where the one metre is coming from.
Can anyone help me?

 
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The question is too vague to answer. It doesn't specify the coordinates of the other child.
 

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