A 7.5-nC charge is located 1.8 m from a 4.2-nC charge. Find the magnitude of the electrostatic force that one charge exerts on the other. Is the force attractive or repulsive?

Physics 2 for Engineering Week 13 Traveling Wave y=A cos (k x-ω t) k=2π/λ ω=2 πf Superposition of Waves y (x, t) =1 (x, t) 2y (x, t) for two waves with same A, k, and ω Constructive interference amplitude = 2A Destructive interference y=0 Standing Wave on a String L = ½ λ 2 nodes Mode 1 Fundamental Mode L=1 λ 3 nodes Mode 2 Second Harmonic / First Overtone L=3/2 λ 4 nodes Mode 3 Third Harmonic / Second Overtone L= 2 λ 5 nodes Mode 4 Fourth Harmonic / Third Overtone λ = 2L / n v=f λ f = v / λ = n v/2L Sound and Hearing: sound waves due to oscillation of molecules; longitudinal wave p = B k