Rotational Dynamics: Solve Problem & Get Help

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The discussion revolves around a problem in rotational dynamics where a user seeks guidance. Participants suggest drawing a diagram to visualize the forces involved, including normal forces and friction. They recommend breaking down the forces into components or moments for better analysis. The emphasis is on understanding the forces acting on the system to solve the problem effectively. Clear visualization and proper force analysis are key to addressing the issue.
boberth2o
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There is this problem that I am having trouble with, can someone guide me through this problem. Thanks

http://img227.imageshack.us/img227/2681/scan0003eq3.png
 
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Hi boberth2o! :smile:

Draw the board with the forces added … that's a normal force at wall 1, and both a normal and friction force at wall 2, and of course the weight.

Then take components, or moments, as appropriate. :smile:
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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