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Dane: Szukane:
m=100kg Ep
H=8m
Ep = mgh
Ep = 100*8=800
Dane:
h = 8m
m = 100kg
g = 9.81 m/s^2
Szukane:
Ep = ?
Ep = m*g*h = 8*100*9.81 = 7848 J
2.
Dane:
m = 20kg
v = 30 m/s
Szukane:
E = ?
E = (mv^2)/2 = 20*900/2 = 9000 J
g= 10N/kg
h= 8m
Szukane: Ep= ?
Wzór: Ep= m*g*h
Obl.:
Ep= m*g*h= 100kg * 10N/kg * 8m= 8000J= 8kJ
2. chyba chodzi o energie kinetyczną:
D: m= 20kg
v= 30km/h
Sz: Ek=?
W: Ek= m*v(do kwadratu)/2 (m*vkwadrat na górze a 2 na dole w mianowniku :P)
Obl.:
Ek= [20kg*(30km/h* 30km/h)] /2= [20kg* 900km/h] /2= 18000J/2= 9000J= 9kJ