Odpowiedzi

2010-03-23T21:17:05+01:00
H=30m=3000cm
D=2mm=0,2cm
r=D/2=0,1cm
V=Pi*r^2*h=3,14*0,1*0,1*3000=94,2
1cm3 => 8,96g
94,2cm3 => x
x=94,2*8,96=844g

2010-03-23T21:20:34+01:00
V = Pi r2 x H
V = PI 0,1 x 0,1 x 3000
V = 0,01 x 3000 Pi
V = 30 Pi
V = 30 x 3,14
V = 94,20 cm3

1 cm3 ------- 8,96 g
94,20 cm3 ----- x

x = 94,20 x 8,96
x = 844,03 g