Answered: Echoes return in 2.5 s to a person…

Echoes return in 2.5 s to a person standing in front of a cliff. How far away is the cliff of the peed of the sound in air at sea level is 343 m/s when the temperature is 20 o C

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter9: Optics

Section: Chapter Questions

Problem 9Q

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Concept explainers

Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.

Question

Solve the following problems. Show your solution.

1. Echoes return in 2.5 s to a person standing in front of a cliff. How far away is the cliff of the peed of the sound in air at sea level is 343 m/s when the temperature is 20 o C

2. The airplane takes off at 9:00 AM and flies in a straight path at 300 km/hr until
1:00 PM, its speed is increased to 400 km/hr and it maintain this speed in the same direction until it lands at 3:00 PM. What is the average speed of the airplane fir the entire flight?

3. An object that is undergoing uniform acceleration from rest moves 7.4 m in 2.5 s. what is the acceleration of the object?

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