physics

Comic-book superheroes are sometimes able to punch holes through steel walls.
(a) If the ultimate shear strength of steel is taken to be 3.00 x 10^9 Pa, what force is required to punch through a steel plate 1.90 cm thick? Assume the superhero's fist has cross-sectional area of 8.00 x 10^1 cm2 and is approximately circular.

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