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3 years ago

If a girl is standing in front of a smooth surface from which a sound is reflected the girl may hear

Physics

2 answers:

sdas [7]3 years ago

8 0

Answer: Echo

Explanation:

Echo means sound being repeated back after a while when sound produced gets reflected back from a surface. The delay in hearing the repeated sound depends on the distance to the reflecting surface. Common example is echo can be heard from an empty well.

Thus, if a girl is standing in front of a smooth surface from which a sound is reflected the girl may hear an echo of her own voice.

Harlamova29_29 [7]3 years ago

7 0

If the girl is also near the source of the sound, two alike sets of sounds will be heard.

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Given that the velocity of blood pumping through the aorta is about 30 cm/s, what is the total current of the blood passing thro

TiliK225 [7]

Answer:

94.248 g/sec

Explanation:

For solving the total current of the blood passing first we have to solve the cross sectional area which is given below:

$A_1 = \pi R^2\\\\A_1 = \pi (1)^2\\\\A_1 = 3.1416 cm^2$

And, the velocity of blood pumping is 30 cm^2

Now apply the following formula to solve the total current

$Q = \rho A_1V_1\\\\Q = (1)(3.1416)(30)\\\\$

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Basically we applied the above formula So, that the total current could come

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KIM [24]

Answer:

The velocity is $v = 4.76 \ m/s$

Explanation:

From the question we are told that

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The second speed is $v_2 = 4.0 \ m/s$

Generally the time taken for first distance is

$t_1 = \frac{d_1 }{v_1 }$

$t_1 = \frac{4000}{5}$

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The time taken for second distance is

$t_1 = \frac{d_2 }{v_2 }$

$t_1 = \frac{1000}{4}$

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The total time is mathematically represented as

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=> $t = 800 + 250$

=> $t = 1050 \ s$

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$v = \frac{d_1 + d_2}{t }$

=> $v = \frac{4000 + 1000}{1050 }$

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daser333 [38]

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