speed 6. A pulse travels along a 40 m length of wire and back in 1.7 s. If the wire has a mass of 10 kg, what is the tension on the wire? 7. A bat receives a reflected sound wave from an insect. If the wave is returned to the bat 0.058 s from the time it was sent, how far is the insect from the bat? 8. Two pianos play sounds at frequencies of 223 Hz and 220 Hz. What beat frequency is heard? 9. A train is traveling south at a speed of 18 m/s and sounds a horn which vibrates at 310 Hz. a) What.is the frequency heard by a car traveling at 30 m/s along a parallel road as it is heading toward the train? b) What is the frequency heard by the car as it is traveling away from the train? the uertical mirror at an incident angle of 55"C. What is the

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