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2*3=6
2*4=8
3*4=12 - największy
0,03m*0,04m=0,0012m²
v=2cm*3cm*4cm=24cm³
d=2,7g/cm³
d=m/v
m=d*v
m=24cm³*2,7g/cm³=64,8g=6,48dag=0,0648kg
Q=m*g
Q=0,0648kg*10m/s²=0,648N
p=F/S
p=0,648N/0,0012m²=540Pa