I'm not sure how to get the correct answer here. I used Fc=mω2r and then measured the length to the joint as 2d√2 and thought that each joint holds the mass of just m, since there is 4 of them. This led me to get F=2dmω2√2 but this is not an answer choice: 
Wednesday, 11 July 2018
homework and exercises - Problem involving centripetal acceleration, rotation, and torque
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