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
trapecia [35]
3 years ago
10

A cop car’s siren has a frequency of 700. Hz. If you are standing on the sidewalk as the cop car approaches you at a speed of 15

.0 m/s, what frequency would you hear? The speed of sound is 343 m/s.
Physics
1 answer:
9966 [12]3 years ago
4 0
The frequency of the siren
You might be interested in
A light-year is the distance that light travels in one year. The speed of light is 3.00 × 108 m/s. How many miles are there in o
Alinara [238K]

Answer:

(a) 5.88\times 10^{12}mi

Explanation:

We have given speed of light c=3\times 10^8m/sec

Given time = 1 year =365 days

We know that in 1 minute = 60 sec

1 hour = 60×60 = 3600 sec

In one day = 24 hour = 24×60×60=86400 sec

So in 365 days = 365×86400=3.1536\times 10^7sec

We know that distance = speed ×time=3.1536\times 10^7\times 3\times 10^8=9.46\times 10^{15}m

We have given that 1 mi = 1609 m

So 9.46\times 10^{15}m=\frac{9.46\times 10^{15}}{1609}=5.88\times 10^{12}miSo option (a) is correct

8 0
3 years ago
The Moon has a radius of 1.7 × 106 m and a mass of 7.3 × 1022 kg. Find the gravitational field on the surface of the Moon.
Lisa [10]

Answer:

10.7*10^{6}

Explanation:

6 0
3 years ago
Pls I need it fast , its for my homework and I can’t find it
frez [133]

Answer:

first one is  series second one is paralle

Explanation:

5 0
3 years ago
An engine absorbs 1.69 kJ from a hot reservoir at 277°C and expels 1.25 kJ to a cold reservoir at 27°C in each cycle.
Anna35 [415]

Answer

Given,

Energy absorbed, Q_H = 1.69\ kJ

Energy expels,Q_C =  1.25\ kJ

Temperature of cold reservoir, T = 27°C

a) Efficiency of engine

 \eta = \dfrac{Q_H - Q_C}{Q_H}\times 100

 \eta = \dfrac{1.69 - 1.25}{1.69}\times 100

\eta =26.03 %

b) Work done by the engine

 W = Q_H- Q_C

 W =1.69 - 1.25

 W = 0.44\ kJ

c) Power output

     t = 0.296 s

   P = \dfrac{W}{t}

   P = \dfrac{0.44}{0.296}

   P = 1.486\ kW

8 0
3 years ago
PLEASE HELP! Compare and contrast between reflection and refraction. Be sure to be specific in your explanation and state in you
horsena [70]

Most ultrasound technicians train in an associates degree, but can also get a bachelors degree in the field. There is also certification programs you can go through. Hope this helped!!! :)

7 0
4 years ago
Other questions:
  • The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis t
    15·1 answer
  • The position of a particle moving along a coordinate line is s equals StartRoot 76 plus 6 t EndRoot​, with s in meters and t in
    12·1 answer
  • Describing Momentum Calculatthe momentum of cars A and answer the question Car A: Mass: 1,000 kilograms Velocity: 40 meters/seco
    10·2 answers
  • Which best describes the relationship between the frequency, wavelength, and speed of a wave as the wave travels through differe
    5·1 answer
  • List some ways houses would be built differently if gravity were much stronger or much weaker ?two
    12·2 answers
  • What are the units of measure used to calculate the acceleration?
    5·2 answers
  • In Speed Study Number 1, we looked at two cars traveling the same distance at different speeds on city streets. Car "A" traveled
    10·1 answer
  • After de Broglie proposed the wave nature of matter, Davisson and Germer demonstrated the wavelike behavior of electrons by obse
    14·1 answer
  • Due in a few minutes plzzzz help! Will mark brainliest
    5·1 answer
  • Suppose that a car weighing 4000 pounds is supported by four shock absorbers Each shock absorber has a spring constant of 6500 l
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!