1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
krek1111 [17]
3 years ago
6

A police car's siren operates at a frequency of 2,000 Hz. What frequency would a stationary listener observe if the police car i

s driving towards him at 65 mph? Note vsound = fλ, where vsound (the speed of sound in air) is 345 m/s. Also, 1 mile = 1.609 km.
Mathematics
1 answer:
SpyIntel [72]3 years ago
3 0

we can use formula

f_L=f_s(\frac{v_a-v_p}{v_a+v_p} )

where

fL is listener frequency

fs is siren frequency

va is the speed of sound in air

vs is police car speed

so, we have

f_s=2000Hz

v_a=345m/s

v_p=65mph

now, we can change it into m/s

v_p=65*\frac{1609}{3600}m/s

v_p=29.05139m/s

now, we can plug it

f_L=2000(\frac{345-29.05139}{345+29.05139} )

f_L=1689.33263Hz..............Answer

You might be interested in
Please help I’ll give brainliest
Oksi-84 [34.3K]
It’s D if not I’m sorry
6 0
2 years ago
Y=-25x+325 What is the slope of this equation?
Bezzdna [24]

Answer:

-25

Step-by-step explanation:

This equation is in the form y = mx + b where m is the slope and b is the y-intercept. Knowing this, we see that -25 is in place of m, so that's our answer.

7 0
3 years ago
If y=3x+5 and z=x^2+2x-5, what is yz?
Hitman42 [59]
<h3>Answer:  3x^3 + 11x^2 - 5x - 25</h3>

Work Shown:

yz = y(x^2+2x-5)

yz = y(x^2) + y(2x) + y(-5)

yz = x^2( y ) + 2x( y ) - 5( y )

yz = x^2( 3x+5 ) + 2x( 3x+5 ) - 5( 3x+5 )

yz = x^2*3x + x^2*5 + 2x*3x + 2x*5 - 5*3x - 5*5

yz = 3x^3 + 5x^2 + 6x^2 + 10x - 15x - 25

yz = 3x^3 + 11x^2 - 5x - 25

6 0
1 year ago
NEED HELP ASAP<br><br>I need answers please ​
Tanzania [10]
Should’ve listened in class buddy
4 0
2 years ago
Read 2 more answers
Help me plsssssssssss
IrinaVladis [17]

Step-by-step explanation:

the equation is -5^2-4

this is because we substitute the variables for the numbers given!

6 0
2 years ago
Read 2 more answers
Other questions:
  • How how fast please I need help​
    8·2 answers
  • The submarine went 1,200 feet below sea level. Enter the integer that represents the submarine's elevation.
    10·2 answers
  • Jen Anderson takes out a mortgage for $120,000. This is a loan of 30 years at $500 per month. This gives a total interest cost o
    13·2 answers
  • Poker. 26 red, 26 black. Take one every time, you can choose to guess whether it’s red. You have only one chance. If you are rig
    6·1 answer
  • What is the image of the point (-7,4) after a rotation of 180 counterclockwise about the origin?
    10·1 answer
  • I could really use some help with this!!!
    9·1 answer
  • Trigonometry ratio of multiple angles<br>​
    15·1 answer
  • Help a girl out ? <br> i linked the attachment .Thank you smmm have a great day.
    7·1 answer
  • 7/2X – 19 = -13 + 2x<br><br>what is the solution equation?​
    14·1 answer
  • Can someone please tell me how to show work for this so I can get an answer I din't understand this!!! :,(
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!