517_Physics ProblemsTechnical Physics

517_Physics ProblemsTechnical Physics - Chapter 17 P17.63 t...

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Chapter 17 519 P17.63 tL vv L =− F H G I K J = 11 air cu cu air air cu L t L = = × × = air cu cu air ms s m 331 3 56 10 3560 331 640 10 234 3 3 bg ej . . . P17.64 The shock wavefront connects all observers first hearing the plane, including our observer O and the plane P , so here it is vertical. The angle φ that the shock wavefront makes with the direction of the plane’s line of travel is given by sin . == = v v S 340 1963 0173 so 997 . . Using the right triangle CPO , the angle θ is seen to be θφ ° = ° 900 900 997 800 .. . . . C O P FIG. P17.64 P17.65 (a) = F H G I K J = × F H G I K J −− sin sin . . 3 331 20 0 10 0948 v v sound obj (b) ′= × F H G I K J sin . . 1 3 1533 20 0 10 440 P17.66 ℘= 21 1 20 0 . ββ
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