Question

Am nevoie de rezolvări:

1)
m=6kg
v=30km/s=30,000m/s
Ec-?

2)
Ep=256g
m=2560g
h-?

3)
h=5m
v-?

Answer 1

1)Se da:
m=6kg
v=30km/s=30000m/s
Ec=?J

Formule:
Ec=mv²/2

Calcule:
Ec=6*30000²/2=27*10⁸J

2)Se da:
Ep=256J
m=2560g=2,56kg
h=?m

Formule:
Ep=mgh
h=Ep/mg

Calcule:
h=256/2,56*10=10m

3)Se da:
h=5m
v=?m/s

Formule:
Ec=Ep
mv²/2=mgh
v²=2gh
v=√2gh

Calcule:
v=√2*10*5=10m/s