For an oblique shock to occur, does the upstream flow have to be supersonic? Does the flow downstream of an oblique shock have to be subsonic?
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Q: The intensity
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For an oblique shock to occur, does the upstream flow have to be supersonic? Does the flow downstream of an oblique shock have to be subsonic?
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- A point source emits 30.0 W of sound isotropically. A small microphone intercepts the sound in an area of 0.750 cm2, 200m from the source. Calculate the power intercepted by the microphone. See Section 9.15 Wave Intensity starting on page 32. You can enter using E notation. example: 5.4 E -10.When an object approaches you at Ma = 0.8, you can hearit, according to Fig. But would there be a Dopplershift? For example, would a musical tone seem to you tohave a higher or a lower pitch?A supersonic jet traveling at Mach 2.80 at an altitude of h = 19,000 m is directly over a person at time t = 0 as shown in the figure below. Assume the average speed of sound in air is 335 m/s over the path of the sound. Observer hears Observer the "boom" (a) At what time will the person encounter the shock wave due to the sound emitted at t = 0? (b) Where will the plane be when this shock wave is heard? (Give the plane's horizontal displaement x.) km Need Help? Read It Master It
- A group of hikers hears an echo 4.00 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 342 m/s.) Need Help? Read ItIt is claimed that an oblique shock can be analyzed like a normal shock provided that the normal component of velocity (normal to the shock surface) is used in the analysis. Do you agree with this claim?Suppose that during a thunder-storm you hear a clap of thunder 9.83 seconds after you see a lightning strike. How far away are you from the lightning strike? Assume room temperature air. Assume light travels so fast that you see the lightning nearly instantaneously.
- A geological disturbance in San Andreas fault generated a seismic wave that was detected in Phoenix, AZ, approximately 1000 km from the epicenter. If such waves travel at an average speed of 6.5 km/s, what would be the time-lag between the disturbance and the detection? How does this speed compare with that of sound waves in air at a day temperature of 23°C? 2.6 min, vseismic/ Vsound 19 O 2.6 min, vseismie/ Vsound 26 O 2.9 min, vseismie/ Vsound 29 O 3.2 min, vseismic/ Vsound 21then If you stood at the same point on a cold day were T2 = -7.5 °C how long is have taken for you to hear the echo in s?An earthquake near the Kenai Peninsula, Alaska, creates asingle “tidal” wave (called a tsunami) that propagatessouthward across the Pacifi c Ocean. If the average oceandepth is 4 km and seawater density is 1025 kg/m3, estimatethe time of arrival of this tsunami in Hilo, Hawaii.