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d = m:V
a) d = 50 :2 = 25kg/m3
b) 23g = 0,023 kg
5dm3 = 0,005 m3
d = 0,023 : 0,005 = 4,6kg/ m3
c) 4 g = 0,004kg
20 cm3 = 0,00002 m3
d = 0,004 : 0,00002 = 200 kg/ m3
zad 2
a) Fg=12 * 10 = 120 N
b) 23g = 0,023 kg
Fg= 0,023 *10 = 0,23 N
c) Fg = 1,2 * 10 = 12N
d) 4t = 4000 kg
Fg = 4000 *10 = 40 000 N
zad 3
skoro d = m:V to m= d*V
m = 12kg/m3 * 2m3 = 24 kg
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