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d=m/v
m=d*v
m=800g/dm3*8dm3=6400g
2dm= 20cm
"ro" = 0,8 g/cm3
V= 20*20*20= 8000cm3
Szukane:
Fg-?
m-?
"ro"= m/V / *V
m= "ro" * V
m= 0,8 g/cm3 * 8000cm3 = 6400g= 6,4 kg
Fg= m *g
Fg= 6,4 kg * 10 m/s2 = 64 N
Odp.: Ciężar wynosi 64 N.