pytania w załacznki oprocz 1a 2 b i 3 b

zad.1. U = 4,5 V I = 0,5 A R = ? R = U/I R = 4,5 V /0,5 A R = 9 Ω zad.2. l = 2 m d = 0,2 mm r = d/2 r = 0,1 mm = 10⁻⁴ m ρ = 1,72 *10⁻⁸ Ω * m R = ?   R = ρ * l/ S 1. obl. S S = πr² S = 3,14 * (10⁻⁴ m )² S = 3,14 *10⁻⁸ m² 2. obl. opór R = 1,72 *10⁻⁸ Ω * m  * 2 m / 3,14 *10⁻⁸ m² R ≈ 1,1  Ω zad.3. P = 100 W= 100 J/s t = 1 h = 3600 s m = 100 kg g = 9,81 m/s² h = ? praca  W = Ep= m * g * h P = W / t   ale W = m * g * h P = m * g *h /t P * t = m * g * h h = P * t /m * g h = 100 J/s  * 3600 s /100 kg * 9,81 m/s² h = 366,97 m h ≈ 367 m jednostki : [ J/kg * m/s² ] = [ kg * m²/s² /kg *  m/s²] = [ m ]