All categories

3 years ago

Why does the frequency of a siren get higher as an ambulance using that siren gets closer?

2 answers:

7 0

The answer is D. As the ambulance gets closer, the sound waves are compressed relative to the person; so the frequency increases.

yarga [219]3 years ago

7 0

I would say that the answer is D)

You might be interested in

what does 1N equal? It happens to be one of the questions on my "Newton's Laws of Motion Exercises" paper.

san4es73 [151]

1 Newton is equal to the amount of force required to accelerate an object at a rate of 1 metre per second, every second. One newton is the force needed to accelerate one kilogram of mass at the rate of one metre per second squared in direction of the applied force.

8 0

4 years ago

What happens to a visible light wave when you increase the frequency

Anastasy [175]

When frequency increases, the wavelength halves.

6 0

3 years ago

Which is the correct Lewis structure for carbon monoxide?<br> А. А<br> В. B<br> С. С<br> D. D

kramer

Answer: Choice B

There are triple bonds between the carbon (C) and oxygen (O) atoms. Then there are 2 dots on either side

==========================================================

Explanation:

When it comes to interaction and chemistry, all that matters is the valence shell or valence electrons. This is the outermost shell. This is because various elements do not interact with the inner electrons (they're locked in place so to speak and don't move to other elements).

Carbon has 6 protons, which is what uniquely makes up this element. This means there are 6 electrons. The inner shell has 2 electrons and the valence shell has 4 electrons. Two electrons are shown as the two blue dots on the left side of the C. The other two electrons form two of the lines, or the bonds, between the C and O.

-------------

Oxygen has 8 protons and 8 electrons. It has 2 electrons in the inner shell and 6 electrons in the valence shell. Two of those electrons are the red dots on the right side of the O. The other 4 electrons are shared to form the bonds with the carbon atom.

This is where things get a bit tricky. I've shown a diagram below indicating that one of the oxygen electrons (red dot) is passed to the carbon, as this carbon atom is pulling on the oxygen electron. But the oxygen atom is pulling on it as well, which forms one of the triple bonds.

So this is why diagram B is the final answer. This is something you can logically determine (remembering the rules of how each electron shell is formed), or it's something you'll need to memorize. In the real world, it's easy to forget a lot of info like this, so that's why having it handy as a lookup reference is preferable.

3 0

3 years ago

Read 2 more answers

Please help me this is due today

Alex_Xolod [135]

Answer:

1) Acids have a sour taste.

Acid formulas start with "H", contain hydrogen and some react with active metals in a single replacement reaction to give off hydrogen gas.

An acid will turn blue litmus paper red

All acids are SOLUBLE in water.

Acids have a pH below 7.

2) Bases are bitter to taste a bitter taste is characteristic of all bases.

trong bases are very corrosive and can burn the skin.

Bases may or may not be soluble in water Bases that can dissolve in water are called alkalis

They can conduct electricity.

Bases lose their basicity when mixed with acids.

3) i dont know how to do it on here sorry but its self explanitory!!

4) 0-3 strongly

4-6 weakly

7 neutral

8-10 weakly

11-14 strongly

hydrochloric acid

lead acid battery

gastric acid

lemon juice

cola

vinegar

orange juice and apple juice

tomato juice

beer

tea or healthy skin

acid rain

coffee

urine

milk

healthy human saliva

pure water

blood

sea water

hand soap

household ammonia

bleach

house hold lye

Explanation:

4 0

3 years ago

You are asked to design a spring that will give a 1070 kg satellite a speed of 3.75 m/s relative to an orbiting space shuttle. Y

Dvinal [7]

Answer:

$380697.33\ \text{N/m}$

$0.138\ \text{m}$

Explanation:

m = Mass rocket = 1070 kg

v = Velocity of rocket = 3.75 m/s

a = Acceleration of rocket = 5g

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

The energy balance of the system is given by

$\dfrac{1}{2}kx^2=\dfrac{1}{2}mv^2\\\Rightarrow kx=\dfrac{mv^2}{x}\\\Rightarrow kx=\dfrac{1070\times 3.75^2}{x}\\\Rightarrow kx=\dfrac{7250}{x}$

The force balance of the system is given by

$ma=kx\\\Rightarrow m5g=\dfrac{7250}{x}\\\Rightarrow x=\dfrac{7250}{1070\times 5\times 9.81}\\\Rightarrow x=0.138\ \text{m}$

The distance the spring must be compressed is $0.138\ \text{m}$

$k=\dfrac{7250}{x^2}\\\Rightarrow k=\dfrac{7250}{0.138^2}\\\Rightarrow k=380697.33\ \text{N/m}$

The force constant of the spring is $380697.33\ \text{N/m}$ .

4 0

3 years ago