Respostas

2013-07-16T20:20:55-03:00
D = m/v

Onde M = massa
e V = volume
 
F = m . g  =  75 N
V = 2,5 * 2,0 = 5m²

F = m .g =>
75 = m . 10
m = 75 : 10
m = 7,5 kg

D = 7,5 : 5 = 1,5kg/m²
2 5 2
2013-07-17T10:00:55-03:00
D = m/v                 m=>massa e v=>volume
 
F = m * g  =>  75 N
V = 2,5 * 2,0 => 5m²

F = m*g => 
75 = m*10
m = 75 / 10
m = 7,5 kg

D = 7,5 / 5
D= 1,5kg/m²