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2 years ago

In a cinema theatre, why do we normally not hear echoes even though the sounds are loud?

Mathematics

1 answer:

ikadub [295]2 years ago

4 0

Answer:

An echo is formed as a result of reflection of the original sound which returns to the listener. You might have experienced Echo in an EMPTY ROOM but no echo is produced after the room is occupied. To avoid echo from being produced the echo has to be absorbed. Echo in a cinema theatre is absorbed by the WALLS of the theatre.

They are not plain. The walls are corrugated or shaped to form tiny holes or empty spaces to ABSORB the ECHO. Modern Theatre's have ABSORBENT materials sticked to the walls of the theatre.

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If 2x2 + y2 = 17 then evaluate the second derivative of y with respect to x when x = 2 and y = 3. Round your answer to 2 decimal

Vera_Pavlovna [14]

Answer:

y''=-1.26

Step-by-step explanation:

We are given that $2x^2+y^2=17$

We have evaluate the second order derivative of y w.r.t. x when x=2 and y=3.

Differentiate w.r.t x

Then , we get

$4x+2yy'=0$

$2x+yy'=0$

$yy'=-2x$

$y'=-\frac{2x}{y}$

Again differentiate w.r.t.x

Then , we get

$2+(y')^2+yy''=0$ $(u\cdot v)'=u'v+v'u)$

$2+(y')^2+yy''=0$

Using value of y'

$yy''=-2-(-\frac{2x}{y})^2$

$y''=-\frac{2+(-\frac{2x}{y})^2}{y}$

Substitute x=2 and y=3

Then, we get $y''=-\frac{2+(\frac{4}{3})^2}{3}$

$y''=-\frac{18+16}{9\times 3}=-\frac{34}{27}$

Hence,y''=-1.26

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2 years ago

Joaquin and Trisha are playing a game in which the lower median wins the game. Their scores are shown below.

iragen [17]

Median is defined as the middle term when the scores are arranged in increasing/decreasing order.

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The answer is letter A.

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2 years ago

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Zula has a conical bird feeder with a volume of 64.3 cubic centimeters and a height of 7 centimeters. Which equation can be used

Ulleksa [173]

Answer:

16.075 is the answer.

Step-by-step explanation:

16.075 is the answer. I hope this helps. You divide

64.3/7

=16.075

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2 years ago

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creativ13 [48]

She can make 6 necklaces and these will be 4 yellow and 6 green on each necklace

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2 years ago

The length of a picture frame is 6 inches more than the width. For what values of x is the perimeter of the picture frame greate

aniked [119]

Answer:

x > 36 in

Step-by-step explanation:

Let x = the width of the picture frame.

Then x + 6 = the length of the frame.

The formula for the perimeter P of a rectangle is'

P = 2l + 2w.

So, the condition is

2l + 2w > 156

2(x + 6) + 2x > 156 Distribute the 2

2x + 12 + 2x > 156 Combine like terms

4x + 12 > 156 Subtract 12 from each side

4x > 144 Divide each side by 4

x > 36

The perimeter of the picture frame will be greater than 156 in if x > 36 in.

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2 years ago

In a cinema theatre, why do we normally not hear echoes even though the sounds are loud?​

In a cinema theatre, why do we normally not hear echoes even though the sounds are loud?