At a beach bathing place, it was discovered that the suspect left clear footprints at the crime scene. The investigators immediately poured the shoe print wax film and measured the average thickness o

At a beach bathing place, it was discovered that the suspect left clear footprints at the crime scene. The investigators immediately poured the shoe print wax film and measured the average thickness of the wax film.

From ρ=mV:

Shoe mold volume V=m mold ρ wax=729g0.9g/cm3=810cm3,

Shoe mold area:< /p>

S0=Vh=810cm33cm=270cm2,

Because people have two feet, the area when the criminal is standing:

S=2S0=2×270cm2= 540cm2=0.054m2,

From p=FS:

∴The weight of the criminal:

G=F=pS=1.8×104Pa×0.054m2= 972N,

From G=mg:

The mass of the criminal suspect m=Gg=972N10N/kg=97.2kg;

Answer: The suspect The mass is 97.2kg.