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
Amanda [17]
3 years ago
9

The Doppler effect is an effect produced by a moving source of sound or electromagnetic waves due to the relative motion of a so

urce or a receiver. If an emergency vehicle approaches Bob and moves away from Jill, how does the frequency of the siren change? A) Neither Bob or Jill perceive any change in the frequency of the siren. B) As an emergency vehicle approaches Bob the frequency appears to increase. C) As an emergency vehicle moves away from Jill the frequency appears to increase. D) Bob does not notice any change until the vehicle passes him and the siren increases.
Physics
2 answers:
Len [333]3 years ago
8 0

Answer:

B) As an emergency vehicle approaches Bob the frequency appears to increase.

Explanation:

As mentioned Doppler effect is related to the waves produced by a moving source. When moving towards the observer, the frequency of the wave will seem to increase and while moving away from the observer, the frequency will seem to decrease.

Here, the vehicle is moving towards Bob and away from Jill. This means, the frequency of the siren will seem to increase while approaching Bob and frequency will seem to decrease while moving away from Jill.

xxMikexx [17]3 years ago
4 0
B. The waves would shorten as the vehicle got closer
You might be interested in
A straight 1.20 m long conductor has a 2.00 A current travelling toward the East. Earth's magnetic field in this location is 4.9
KATRIN_1 [288]

Answer:

Force's magnitude=1.176\,10^{-4}\,N

Direction: down (towards the center of the Earth)

Explanation:

Recall that the magnetic force on a conductor of length L carrying a current I in a magnetic field B is given by the equation: F=I\,L\,B in the case the magnetic field B and the direction of the current are at 90 degrees from each other (which is our case). The direction of the force will be given by the "right hand rule" associated with the vector product that defines this force.

Since the current is moving East, and the magnetic field of the Earth goes from North to South, the resultant Force vector will be pointing towards the Earth (and perpendicular to the plane defined by the current's direction and the magnetic field B)

The magnitude of the force, is given by the formula above, and given that all quantities to be considered are is SI units, it will result in Newtons (N):

F=I\,L\,B\\F=2\,*\,1.2\,*\,4.9\,10^{-5}\,N\\F=1.176\,10^{-4}\,N

8 0
4 years ago
Which number should be placed in the blank to make the equation balance? 3 H2+ N2 --- ______ NH3
miv72 [106K]
2 should be placed in the blank to make the equation balance. Btw, that's chemistry and not physics. Get it right.
7 0
3 years ago
What is the average power output pf a weight lifter who can lift 250 kg 2.0 m in 2.0 s
liq [111]

Answer:

Power = 2.45Kw or 2450 Watts.

Explanation:

<u>Given the following data;</u>

Mass, m = 250kg

Height, h = 2m

Time, t = 2secs

We know that acceleration due to gravity, g is equal to 9.8m/s²

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

Power = \frac {Energy}{time}

But Energy = mgh

Substituting into the equation, we have

Power = \frac {mgh}{time}

Power = \frac {250*9.8*2}{2}

Power = \frac {4900}{2}

Power = 2450 Watts

To convert to kilowatt (Kw), we would divide by 1000

Power = 2450/1000

Power = 2.45Kw.

Therefore, the average power output of the weightlifter is 2.45 Kilowatts.

8 0
3 years ago
Harry and Cassie wanted to conduct an experiment to see how many licks it takes to get to the center of a tootsie roll pop. Belo
umka2103 [35]

Hey there!

The answer is that The data was not reliable because there was not any repetition.

An experiment should be completed multiple times to be sure of accurate results.

A screenshot is attached.

Hope this helps! :)

6 0
4 years ago
Read 2 more answers
which of the following body systems has the main function of sending signals from one part of the body to the other parts of the
Vadim26 [7]

Answer: Nervous system!

Explanation:

The nervous system sends and receives electrical messages all through out your entire body to instruct it on what to do or help send messages to the brain about what’s happening to that certain area.

8 0
3 years ago
Other questions:
  • An ant starts at one edge of a long strip of paper that is 34.2 cm wide. She travels at 0.4 cm/s at an angle of 52◦ with the lon
    13·1 answer
  • A group of organisms that is able to interbreed is called a
    11·1 answer
  • A baseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. After it is hit, the ball leaves the bat at 50.0 m/s directl
    5·1 answer
  • What is the speed of a car that travels 0.200 km in 95 seconds? State your answer in meters per second.
    6·1 answer
  • Using newtons law How much force is accelerated a 66kg skier 2m/s2
    9·1 answer
  • .Una moto circula a 72km/h. Frena hasta detenerse y tarda 10 segundos en dicha operación.
    8·1 answer
  • You push down on a 3 N box for 5 minutes. How much work was done?
    12·2 answers
  • Help<br> Question 6: Which of these is Not a unit of density?
    15·1 answer
  • Lee knew that certain events occur to create new material in the process of sea-floor spreading. Rearrange the steps into the co
    10·1 answer
  • An energy storage system based on a flywheel (a rotating disk) can store a maximum of 3.7 MJ when the flywheel is rotating at 16
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!