Răspuns:
5.
10m/s=36km/h
72km/h=20m/s
1g/cm^3=1kg/m^3
1200 kg/m^3=1.2g/cm^3
6.Pabcd=44cm
G=27N
a)m=?
G=mg
27=m*10
m=27/10
m=2.7
b)p=2.7g/cm
v=?
p*1000=2700kg/m
p=m/v
2700=27/v
2700*v=27
v=27/2700
v=0.01m^3
c)p=1g/cm^3|*1000
p=1kg/m^3
1kg=m/0.01
1kg*0.01=m
1000g*0.01=m
10g=m
G=10g*10
G=100g*m/s^2
G=0.1N
7. G=mg
G=4*10
G=40N
F=K*L
40N=k*10m
k=4N/m
