You are trapped inside Home Depot with ten pounds of each aluminum, brass, steel

Question

You are trapped inside Home Depot with ten pounds of each aluminum, brass, steel,and tin lying around. There is a horde of massive zombies outside attacking the door. Pick a material to build a one foot long and 1.75 inch wide (OD) hollow tube in which you can use to prop the door shut in order to save yourself. If your pipe can bend by 10 degrees before breaking, how many zombies will need to push on the door before it fails? Assume that each zombie can exert 2.75 N of force and that all the stress is being applied to the end of the pipe.

Explanation / Answer

Stress= F*L/A*deltaL

        = 2.75*LCos(100)*/*pi(r2)**L(1-Cos(100))

   stress= 11.4875N/m2    

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