Midterm_2_EQ

# Midterm_2_EQ - Physics 1B Sound Waves MIDTERM 2 Lectures...

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Physics 1B MIDTERM 2 Lectures 12-25 Kyle Chin Sound Waves ρ air ¶u ¶t = - ¶P ¶x P = - B D V V v x = B r air KE = 1 2 BV Beats : N beats/second = f envelope = f 1 - f 2 Standing Sound Waves : open-open : λ n = 2 L n f n = v l n = nv 2 L open-closed : n = 4 L n f n = nv 4 L (odd n ) Doppler Effect f obs = f src v s ± v obs v s m v src ae è ç ö ø ÷ +v obs toward source … -v obs away from source -v src toward observer … +v src away from observer r wave = v s ( t - t 0 ) Mach # : Angle of elevation for shockwave ( v obj > v s ): sin q = v s v obj v obj = Mv s M = 1 sin q Electricity Coulomb’s Law : F = kQ 1 Q 2 r 2 ) r = Q 1 Q 2 4 pe 0 r 2 ) r F = qE ( r ) where electric field E ( r ) = kQ r 2 ) r = Q 4 pe 0 r 2 ) r F = qE ( r ) can be rewritten as W = qV ( r ) Charge density : = dQ dL for uniform density Q TOTAL = l 0 L σ = dQ dA Electric field above an infinite plane: E ( z ) = s 2 e 0 ) z (constant) = dQ dV Q TOTAL

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Midterm_2_EQ - Physics 1B Sound Waves MIDTERM 2 Lectures...

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