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# exam2 - Physics 2020 Exam 2 Constants and Formulae Useful...

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Physics 2020 Exam 2 Constants and Formulae Useful Constants k e = 8 . 99 × 10 9 N m 2 /C 2 c = 3 . 00 × 10 8 m/s μ = 4 π × 10 - 7 T m/A e = 1 . 602 × 10 - 19 C m e = 9 . 110 × 10 - 31 kg m p = 1 . 672 × 10 - 27 kg = 8 . 85 × 10 - 12 C 2 /(N m 2 ) g = 9 . 80 m/s 2 1 eV = 1 . 602 × 10 - 19 J 1 T = 10 4 G 1 km = 10 3 m 1 hr = 3600 s 1 day = 8 . 64 × 10 4 s 1 yr = 365.242 days 1 milli (m) = 10 - 3 1 micro ( μ ) = 10 - 6 Useful Formulae C (circle) = 2 πr D (circle) = 2 r A (circle) = πr 2 = πD 2 / 4 V (sphere) = 4 3 πr 3 A (sphere) = 4 πr 2 V (rectangular box) = L · W · H sin θ = (opposite)/(hypotenuse) r 2 = x 2 + y 2 cos θ = (adjacent)/(hypotenuse) 1 = cos 2 θ + sin 2 θ tan θ = (opposite)/(hypotenuse) tan θ = sin θ/ cos θ v 2 = v 2 + 2 a ( x - x ) v = v + a ( t - t ) x = x + v ( t - t ) + 1 2 a ( t - t ) 2 R = | R | = R 2 x + R 2 y R x = R cos θ R y = R sin θ

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Useful Formulae (continued) F g = w = mg W = ( F cos θ ) s = Δ(KE) KE 1 2 mv 2 PE g = mgy KE i + PE i = KE f + PE f p mv F e = k e | q 1 || q 2 | /r 2 12 E = F e /q P = W/ Δ t = I Δ V = I 2 R = (Δ V ) 2 /R W = ΔPE = q Δ V = q E d I = Δ Q/ Δ t R = Δ V/I C = Q/ Δ V C = A/d U = Q 2 / (2 C ) = 1 2 C V ) 2 = 1 2 Q V ) V = k e q/r R eq = R i (series) 1 /R eq = (1 /R i ) (parallel) I 1 = I 2 = I i = I (series resistors) Δ V = Δ V i (series resistors) Δ V 1 = Δ V 2 = Δ V i = Δ V (parallel) I = I i (parallel resistors) Δ V = E - Ir q = Q 1 - e - t/RC (charging) τ = RC q = Qe - t/RC (discharging) F = qvB sin θ F = BI sin θ r = mv/qB B = μ I/ (2 πr ) B Δ = μ I Φ B = BA cos θ E = - N ΔΦ B / Δ t = - L Δ I/ Δ t Δ V = E = E = B v L = μ N 2 A/ = μ n 2 A = μ n 2 V I = |E| /R = ( B v ) /R
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exam2 - Physics 2020 Exam 2 Constants and Formulae Useful...

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