d$.624$ g

$9-(10$ Pts$)$ What is the average pressure under Joe's shoes if his mass is $81$ kg and his shoes rest on an area of $11cm21cm?$

a$.34$ KN

b$.0\mathrm{.}034$ MPa

c$.34$ KPa

d$.3\mathrm{.}4$ Pa

e$.$ Both $b$ and $c$

$10-(10$ Pts$)$ If two materials A and $B$ are tested and they both have the same yield stress magnitude and same maximum strain, but material A has a yield strain of $50\%$ and material B has a yield strain of $25\%$ :

a$)$ Which material has a better "toughness". Why?

b$)$ Which material is more elastic? Why?