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the 5 A ship's horn blasts through the fog. The sound of the echo from an iceberg is heard on the ship 3.8 s later. How far away is the iceberg if the temperature of the air is -12 C? (hint: determine the speed of sound in air at -12.C first) 3 Usound : ? 6. An ambulance siren creates a sound with a frequency of 825 Hz. If the ambulance is approaching you with a speed of 15 m/s and the speed of sound is 343 m/s, what frequency will you hear? 3 7. Two pulses are sent toward each other along a spring. Use the principle of superposition to draw the resulting waveform when the pulses overlap. 2 8. A cat (which has been launched from a cannon all the way back in the motion unit) is approaching you at a speed of 12.0 m/s. The air is a pleasant 25.0 .C. What is the Mach number of the cat? 2