Un corp din aluminiu cu masa m=270g la temperatura t0=20grade celsius are densitatea P=2,7g/cm cub.Incalzind corpul la temperatura t=80 grade celsius volumul sau creste cu 420 mm cubi.Ce densitate are corpul la temperatura de 140 grade celsius?
Ro=MsupraV=2700gsupra27g.cmc=100g/cmc=20grade=80grade-20de grade=60 de grade=420mmc=20grade=140mmc=140de grade=980mmc=0,980cmcubi=RoF=MsupraV=270gsupra0,980cmcubi=Amplificam prin 1000=270000gsupra980g/cmcubi=0,028g/cmcubi.
