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positive motion direction Lernen beginnen
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angular acceleration average Lernen beginnen
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ω if ang. acc. is constant Lernen beginnen
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qngle if ang acc is constant Lernen beginnen
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the bigger moment of inertia Lernen beginnen
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the more energy needed, the harder to start rotation
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kinetic energy in rotation Lernen beginnen
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Potential energy in sprężyna Lernen beginnen
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I=I0 + md^2 (d-odleglosc od osi obrotu)
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T= r x F (cross product, rFsinθ) OR T=αI (α -angular acc)
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p=p0 + ρgh (p0-cisnienie atmosferyczne 10^5Pa)
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weight of object in water Lernen beginnen
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BUOYANCY weight of displaced fluid =sila wyporu Lernen beginnen
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B=ρ fluid V displaced g = mg jesli sytuacja jest stanilna
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fluid movement mass conservation Lernen beginnen
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Bernoulli's equation - comparing points in the same flowtub Lernen beginnen
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p + ρgh + 1/2ρv^2 =const.
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ΔL=αL0Δt (α - thermql expansion cooficiant)
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lenght after thermal expansion Lernen beginnen
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Q= kAΔT (A-powierzchnia styku
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R=L/(Ak) (L-lenght, A - area of section)
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H=σeAT4 (A -surface area, σ-stała Stefana Boltzmana, e - material propety)
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H net =σeAT4 enviroment - σeAT4 object
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y= F lo / AΔl (lo- poczatkowa dlugosc rozciaganego ciala)
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B= -Δpvo/Δv (p pressure v objetosc)
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prędkość katowa - oscillation Lernen beginnen
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Hooke's law (restoring force) Lernen beginnen
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oscillation: a(t) 2 methods Lernen beginnen
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a(t)= (-k/m) x(t) OR a(t)=-ω^2 A cos(ωt+θ)
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Predkosc katowa ω w oscylacji Lernen beginnen
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for small θ k dla wahadla Lernen beginnen
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v= sqrt restoring force/inertia resisting the force
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I = P/A (if 3D wave, the area= 4πr^2)
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intensity to r of 2 waves Lernen beginnen
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string fixed with 2 ends λ Lernen beginnen
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speed of sound wave in fluid Lernen beginnen
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v=sqrt (B/ρ) B-Bulk modulus
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speed of sound wave in q rod Lernen beginnen
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v= sqrt(Y/ρ) Y-Yungs modulus
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speed of sound in ideal gas Lernen beginnen
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v= sqrt (γRT/M) M-molar mass
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P= 1/2 sqrt(μF)ω^2A^2 (in fluid μ>ρ, F>B)
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f=nv/4L but n is nieparzyste
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V=U/q (U - potential energy) OR V=EL (E-electric field, L-lenght of wire)
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I=Q/Δt OR I=nAqv (n-number of charges per unit of volume, A-area of section, v- drift velocity) OR
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ρ=R/J (E-electric field, J-current density)
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Resistence (not from Ohms law) Lernen beginnen
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R=ρL/A (ρ-Resistivity, L-lenght of wire, A-area of section)
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ε=IR (often happens that I(R+r))
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równolegle, R>nieskończoność
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internal energy of resistor Lernen beginnen
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U=NqΔV (V-voltage, N-number of charges)
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power of resistor 2 methods Lernen beginnen
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P= U internal /Δt = ΔV^2/R
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v^2=v0^2+2aΔx (Δx-przemieszczenie)
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