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The above figure shows a uniform iron beam of mass 254 kg and length L = 3 m. The cable holding the beam in place can take a tension of 1300 N before it breaks. (You may ignore the small mass of the cable in this calculation.)

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a)What minimum length of the cable?

b) Assume the cable is made of steel and has a diameter of 1". How much will it stretch before it breaks?

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Okay. I am stuck on part a so far. I know that this is a static equilibrium, therefore, the summation of all the forces in x and y direction equal zero.

Also, the summation of torques must also equal zero.

But I'm not sure how to write out the equations. Can someone give me a lending hand?

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# Homework Help: Minimum length of cable help

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