zadania w załączniku ;) prosze pomóżcie to jest dla mnie bardzo wazne ;]
zad.11.B
a) m = 2 kg
V = 9 m/s
Ek = m * V²/2
Ek = 2 kg * 81 m²/s²/2 = 81 J
b)
m = 0,3 kg
h = 70 m
g = 10 m/s²
Ep = m*g * h
Ep = 0,3 kg * 10 m/s² * 70 m = 210 J
c)
m = 80 kg
V = 2 m/s
Ek = 80 kg * (2 m/s)²/2 = 160 J
d )
m = 0,1 kg
h = 10 m
V = 15 m/s
Ep = m * g * h
Ep = 0,1 kg * 10 m/s²* 10 m = 10 J
Ek = 0,1 kg * (15 m/s)²/2= 11,25 J
E = Ep + Ek = 21,25 J
zad.12.a
zad.13 c
zad.14 a
zad.15 d
zad.16 b (zamiana gazu w ciało stałe)
zad.17 a
zad.18.
Q = 2,21 MJ = 2210000 J
ct = 340000 J/kg
m = ?
Q = m * ct
m = Q/ct
m = 2210000 J /340000J/kg = 6,5 kg
m = 6,5 kg = 6500 g
zad.19. b ( im wyżej tym ciśnienie atmosferyczne jest niższe)
Zad.11 b.
Ep = mgh
Ek = 0,5v^2
a) Ek = 0,5*2kg*(9m/s)^2 = 81 J
b) Ep = 0,3kg *10m/s2 *70m = 210 J
===============================
c) Ek = 0,5 *80kg*(2m/s)^2 = 160 J
d) E = Ep + Ek = 0,1kg*10m/s2*10m + 0,5*0,1kg*(15m/s)^2 = 10J +11,25J = 21,25 J
Zad.12 a.
Zad.13 c.
Zad.14 a.
Zad.15 d.
Zad.16 b.
Zad.17 a.
Zad.18 d.
dane:
Q = 2,21 MJ = 2 210 000 J
Ct = 340 000 J/kg
szukane:
Q = m* Ct /:Ct
m = Q/Ct
m = 2210000J/340000J/kg = 6,5 kg
m = 6500g
Zad.19 b.
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zad.11.B
a) m = 2 kg
V = 9 m/s
Ek = m * V²/2
Ek = 2 kg * 81 m²/s²/2 = 81 J
b)
m = 0,3 kg
h = 70 m
g = 10 m/s²
Ep = m*g * h
Ep = 0,3 kg * 10 m/s² * 70 m = 210 J
c)
m = 80 kg
V = 2 m/s
Ek = m * V²/2
Ek = 80 kg * (2 m/s)²/2 = 160 J
d )
m = 0,1 kg
h = 10 m
V = 15 m/s
Ep = m * g * h
Ep = 0,1 kg * 10 m/s²* 10 m = 10 J
Ek = m * V²/2
Ek = 0,1 kg * (15 m/s)²/2= 11,25 J
E = Ep + Ek = 21,25 J
zad.12.a
zad.13 c
zad.14 a
zad.15 d
zad.16 b (zamiana gazu w ciało stałe)
zad.17 a
zad.18.
Q = 2,21 MJ = 2210000 J
ct = 340000 J/kg
m = ?
Q = m * ct
m = Q/ct
m = 2210000 J /340000J/kg = 6,5 kg
m = 6,5 kg = 6500 g
zad.19. b ( im wyżej tym ciśnienie atmosferyczne jest niższe)
Zad.11 b.
Ep = mgh
Ek = 0,5v^2
a) Ek = 0,5*2kg*(9m/s)^2 = 81 J
b) Ep = 0,3kg *10m/s2 *70m = 210 J
===============================
c) Ek = 0,5 *80kg*(2m/s)^2 = 160 J
d) E = Ep + Ek = 0,1kg*10m/s2*10m + 0,5*0,1kg*(15m/s)^2 = 10J +11,25J = 21,25 J
Zad.12 a.
Zad.13 c.
Zad.14 a.
Zad.15 d.
Zad.16 b.
Zad.17 a.
Zad.18 d.
dane:
Q = 2,21 MJ = 2 210 000 J
Ct = 340 000 J/kg
szukane:
m = ?
Q = m* Ct /:Ct
m = Q/Ct
m = 2210000J/340000J/kg = 6,5 kg
m = 6500g
Zad.19 b.