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.