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Fofino [41]
3 years ago
11

What is the frequency heard by a person driving at 15 m/s toward a blowing factory whistle (750 hz if the speed of sound is 343

m/s?
Physics
1 answer:
frez [133]3 years ago
6 0

Answer:

= 784.30 Hz

Explanation:

Using the formula;

f₀ =(v.fs)/(v-vp)

Where; f₀ is the observed frequency, v is the speed of sound in air, fs is the frequency of the source and vp is the speed of the person towards the whistle.

In this case;

Speed of sound in air = 343 m/s

Speed of the person towards the whistle = 15 m/s

Frequency of the source = 750 Hz

Therefore;

f₀ = (343 × 750)/ (343 -15)

   = 784.30 Hz

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murzikaleks [220]

Answer:

Answer :-  150.79cm2

Explanation:

                                               A=2πrh+2πr2

                                                 2·π·2·10+2·π·22

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5 0
3 years ago
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A collapsible plastic bag (figure below) contains a glucose solution. If the average gauge pressure in the vein is 1.29 A collap
expeople1 [14]

Answer:

0.125 m

Explanation:

Pressure in fluids is given as the product of density, height and acceleration due to gravity and expressed as

P=hdg

Where h is the height, d is density, g is acceleration due to gravity and P is pressure.

Making h the subject of formula then

h=P/dg

Given specific gravity of a substance, its density is equal to specific gravity multiplied by density of water. Taking density of pure water as 1000 kg/m³ then the density of reference fluid will be 1.05*1000=1050 kg/m³

Substituting pressure with 1.29*10³ pa as given then taking g as 9.81 m/s² then

H=1.29*10³÷(9.81*1050)=0.1252366389981068880151448958788408329692m

Rounded off, the height is approximately 0.125 m

8 0
3 years ago
When does total internal reflection occur?
gogolik [260]

Answer:

A

Explanation:

I believe it is A because reflection is usually like a mirror or in water the other ones described are refraction or conversion. Hope this helps! :)

3 0
3 years ago
The speed of light in a vacuum is approximately 2.99 × 108 m/s, and the speed of light through a piece of glass is approximately
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The answer is 1.52.

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3 years ago
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A car drives at a velocity of 6.8 m/s for 250 seconds. How far did it travel?
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\qquad \qquad\huge \underline{\boxed{\sf Answer}}

Here's the solution ~

As we know, Displacement =

\qquad \sf  \dashrightarrow \: velocity  \times time

\qquad \sf  \dashrightarrow \: 6.8 \times 250

\qquad \sf  \dashrightarrow \: 1700 \: m

<h3>OR </h3>

\qquad \sf  \dashrightarrow \: 1.7 \: km

The car travelled 1700 meters ( 1.7 km )

8 0
2 years ago
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