Phy 121
Your 'cq_1_20.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The problem:
The metal strap used in the Angular Velocity of a Strap experiment is constrained by a vertical push pin to rotate about a hole in a die. The die is glued in place to a massive tabletop. A rubber band is attached to a point 15 cm from the axis and stretched so that it exerts a force of 3 Newtons, directed perpendicular to the rod. If this force is unopposed it will accelerate the system rapidly. You want to attach a second rubber band 5 cm from the axis to prevent the system from rotating.
• How much force will that rubber band have to exert?
answer/question/discussion: ->->->->->->->->->->->-> :
I am guessing that the rubber band would need to exert a force that is equal and opposite to that of the first rubberband. Based on the idea that our first band when just multiplying the length the rubberband is from the axis and also the force being exerted is a total of 45 then I think that the force that needs to be exerted on the second rubber band is 9N. I would think that this would counter balance the force from the first band and they will hopefully remain stationary.
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• Once both of these forces are in place and the system is stationary, what (if anything) will happen if the glue holding the die to the tabletop comes loose?
answer/question/discussion: ->->->->->->->->->->->-> :
If the system is stationary then and the glue holding the die becomes loose, then I think that the strap will remain stationary as long as it remains untouched. As long as the weight is equally distributed, then I can’t foresee how it would move on its own.
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30 minutes
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Solution
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