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Posted by on Monday, April 16, 2012 at 6:50pm.

Comic-book superheroes are sometimes able to punch holes through steel walls.
(a) If the ultimate shear strength of steel is taken to be 2.90 109 Pa, what force is required to punch through a steel plate 2.10 cm thick? Assume the superhero's fist has cross-sectional area of 1.05 102 cm2 and is approximately circular.

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