# FinalEqs - Physics 135-3 Physical Constants Speed of sound...

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Physics 135-3 Final Exam Eq. Sheet Spring 2006 Physical Constants : Conversions : Speed of sound in air v = 343 m/s 1 meter = 100 cm = 1000 mm = 10 6 : m Speed of Light in Vacuum c = 3.0 × 10 8 m/s = 10 9 nm = 10 -3 km Permittivity Constant , o = 8.85 × 10 -12 F/m 1 mi = 5280 ft = 1609 m Permeability Constant : o = 1.26 × 10 -6 H/m 1 light-year = 9.46 × 10 15 m Acceleration of gravity g = 9.8 m/s 2 = 32 ft/s 2 1 y = 365.25 d = 3.16 × 10 7 s Charge on the electron e = 1.6 × 10 -19 C 1 eV = 1.6 × 10 -19 J Planck’s Constant h = 6.63 × 10 -34 J A s = 4.14 × 10 -15 eV A s Stefan-Boltzmann const. F = 5.670 × 10 -8 W/m 2 A K 4 Electron Mass m e = 9.11 × 10 -31 kg Proton Mass m p = 1.67 × 10 -27 kg Bohr Radius a = 5.29 × 10 -11 m Rydberg constant R = 0.01097 nm -1 Geometry : Sun : Area of circle: Mass = 1.99 × 10 30 kg A r = π 2 Surface area of sphere: Power = 3.90 × 10 26 J/s S r = 4 2 π Mechanical Waves & Sound : where: y x t y kx t m ( , ) sin( ) = ± ω k f T v k T f = = = = = = 2 2 1 π λ ω π ω λ λ v = τ μ = + y x t y kx t m ( , ) [ cos ]sin ( ) 2 1 2 1 2 ϕ ω ϕ ( n = 1, 2, 3 ... ) = y x t y kx t m ( , ) [ sin ]cos 2 ω f n v L = 2 ϕ λ π = Δ L 2 where n = 1, 2, 3, ... where n = 1, 3, 5, ... f nv L = 2 OR f nv L = 4 where v a

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