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Maksim231197 [3]
3 years ago
14

Sound waves travel at the rate of 343 m/s at 20°C. If a man standing 450 meters away from the wall of a canyon yells, “Hello,” h

ow long will it take for him to hear his own voice echo off of the wall?
Physics
2 answers:
Sophie [7]3 years ago
8 0

Answer:

\Delta t = 2.624\,s

Explanation:

Sound is a form of mechanic wave, which needs a medium to propagate itself and has a constant speed. The time needed to hear his echo is:

\Delta t = \frac{900\,m}{343\,\frac{m}{s} }

\Delta t = 2.624\,s

nekit [7.7K]3 years ago
5 0

Answer:

2.62seconds

Explanation:

Speed is defined as the ratio of the distance covered by a body with respect to time.

Speed v = Distance (s)/Time (t)

For a traveling sound wave, the distance between the source of a sound and the reflector is '2S'.

Speed v = 2 × distance (S)/Time (T)

V = 2S/t

2S = vt

Given speed of the wave = 342m/s

Distance covered = 450m

t = 2S/v

t = (2×450)/343

t = 900/343

t = 2.62seconds

It will take him 2.62seconds for him to hear his own voice echo off of the wall.

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eduard

Given:

The initial velocity of the object, v=30 m/s

a_t=0

a_c≠0

The time period is Δt.

To find:

The right conclusion among the given choices.

Explanation:

a_t represents the tangential accleration on the object and a_c represents the centripetal acceleration on the object.

The centripetal acceleration is the acceleration that keeps the object in its circular path. The centripetal force only changes the direction of the velocity and not the magnitude.

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Final answer:

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Therefore, the correct answer is option a.

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