Question: please explain fully If the Mach number is 0.81 and the speed of an airplane measured by radar is 850 km/h, what is the local

  1. please explain fully
  2. If the Mach number is 0.81 and the speed of an airplane measured by radar is 850 km/h, what is the local speed of sound in kilometers per hour?

  1. Research hearing loss in urban vs rural areas. What do you notice? How can you explain this difference?

  1. If a mass-spring system is hung vertically and set into vibration, why does the motion eventually stop? Sketch a graph that represents the amplitude of vibration over time. Annotate the graph(label the different components).

  1. Watch the Bunsen Burner-tube demo. Why is a loud sound heard? Explain fully.

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