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horsena [70]
3 years ago
15

The back wall of an auditorium is 30.0 m from the stage. If you are seated in the middle row, how much time elapses between a so

und from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?
Physics
1 answer:
Kipish [7]3 years ago
4 0

Answer:

<h2>0.0875 sec</h2>

Explanation:

Using the relationship to calculate the time that elapse 2x = vt

x = distance between the source and the reflector

v is the velocity of sound in air

t = time elapsed

Given x = 30.0m and v = 343m/s

substituting the values into the formula above to get the total time elapsed t;

t = 2x/v

t = 2(30)/343

t= 60/343

t = 0.175sec

If you are seated in the middle row, the time that will elapse between the sound from the stage reaching your ear directly will be;

0.175/2 = 0.0875 secs

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Answer:

15 meters

Explanation:

The inicial energy of the ball is just potencial energy, and its value is:

E = m * g * h = m * g * 20,

where m is the ball mass, and g is the value of gravity.

In the moment that the ball strickes the ground, all potencial energy transformed into kinetic energy, and 25% of this energy is lost, so the total energy at this moment will be:

E' = 0.75 * E = 0.75 * m * g * 20 = 15*m*g

This kinetic energy will make the ball goes up again, and at the maximum height, all kinetic energy is transformed back into potencial energy.

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3 years ago
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8 0
3 years ago
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Diano4ka-milaya [45]

Answer:

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