1: You are watching a Star Trek episode. The characters on the Enterprise see an

Question

1: You are watching a Star Trek episode. The characters on the Enterprise see another ship explode in space. The explosion is accompanied by a loud "boom". Is there anything wrong with this? Explain. 2: A stone is dropped from rest into a deep canyon It is heard to hit the bottom 10.2 s after being released. How deep is the canyon? 3: In a longitudinal wave in a slinky, the coils move back and forth along the wave's direction of motion. Does the speed of the coils depend upon the speed of the wave? If yes, then explain why. If no, then explain what the speed does depend upon 4: The pressure variation in a traveling sound wave is described by Ir(r,t) 10 sin(2.94x2 1000t) Pa. What is the speed of the wave? b: What is the smallest distance between two molecules one of which is at its maximum displacement and one of which has zero displacement? Explain c: Determine the maximum rate at which the pressure changes d: Determine the maximum acceleration of a molecule. Assume that 1.2 kg/m3 e: The wave is perfectly absorbed by a 2m2 surface which lies perpendicular to the wave velocity. How much energy is transfered to that surface in 10 s? 5: A speaker lies between two people who are 110 m apart. Joe measures an intensity of 80 dB while Tom measures an intensity of 60 dB. How far is the speaker from Joe? 6: How many people whispering at 20 dB are needed to produce the sameove intensity as a nearby train creating sound at 90 dB? You may assume that the intensities of the sound due to each person just add together (even though that isn't always completely true) 7: As we have seen, the intensity from a point source is proportional to 1/r2, However, at the same time we know that the sound wave intensity can be written as pu Since and u are approximately constant, this means the Pnax x 1/r. Similarly, wsmax X 1/r. Does w change? Does smax change? Or do they both change? Explain. Can you explain why Pax changes? Your answers must be physical in nature (not mathematical). Think about the collisions which help the wave propagate.

Explanation / Answer

2) time taken = distance / speed

speed of sound in air = 343 m/s

10.2 = d / 343

d = 3498.6 m

the canyon is 3498.6 m deep

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.