1.

. A person can “ walk on water “ if she has the proper shoes. Assume that you use expanded polystyrene (ρ = 0.40 g/cm3 ) to construct two blocks that you will strap to your feet, with a cross section of 850 cm2 . How long will each block need to be in order to support a 65 kg person?

Answer» F=mg = (65)(9.8)= 637

F = (0.4 g/cm3)(850 cm2)(9.8)(h)

F = 3332 (h)

637 = 3332(h)

0.19 = h


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