PHYSICS MIDDLE SCHOOL

How to do the equation p1v1 = p2v2 as an equation layed out like:P1V1=P2V2
equation
answer
for the question "A sealed of gas at 101,000 Pa is expanded, reducing the volume from 0.5m3 to 0.25m3."

Answers

Answer 1
Answer:
P1 and P2 are the pressures, and V1 and V2 are the volumes. So you take the first pressure and volume you are given and place them into the equation P1V1 so the first part of the equation would be 101000*0.5 = P2V2. You then rearrange the equation to find what you want, in this instance you would do 50500/0.25 = P2... therefore P2 = 2020000Pa or 2.02*10^6Pa

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Please help me! URGENT!

Answers

A physical change is a change in which no new matters are formed.

Let's get started:
1. a rusting bicycle
This is NOT a physical change because a new substance is formed.
3Fe+ 2O2 -> Fe3O4

2. breaking glass
This is a physical change.

3. melting butter
This is a physical change.
You just change the phase of butter from solid to liquid, but still there is no new substance formed.

4. burning leaves
When you burn something organic, CO2 will be formed.
Therefore, this is NOT a physical change.

5. cutting your hair
This is a physical change.

6. frying an egg
When you fry an egg, iron (Fe) in the yolk reacts with hydrogen sulfide (H2S) in the white to form iron sulfide (FeS).
Therefore, this is NOT a physical change.

7. water evaporating
With the same reason as 3, this is a physical change.

8. mixing salt and water
This is a physical change (with the same reason as 3).
NaCl (s)+ H2O -> NaCl (aq)

Hope this helps~
A physical change only includes changes in state, not the bonds. 

Answer:- 

- breaking glass
- melting butter
- cutting your hair
- water evaporating. 
- mixing salt and water 

What kind of graph uses points on a grid connected by line segments to represent data and is usually used to show change over time.

Answers

Line Graph

Hope this is what you are looking for! 

Which statement is the BEST definition of an atom? A) Anything that has mass and occupies space. B) The smallest particle that has the properties of an element. C) A substance that cannot be broken down chemically into simpler substances. Eliminate D) The smallest unit of a substance that exhibits all of the properties characteristic of that substance.

Answers

the answer is d because an atom is the smallest unit of a substance

Where tornadose occur in the usa

Answers

Tornadoes can occur all over the place,  but are most commonly occuring in Tornado Alley (it's in the central of the US,  In places like Oklahoma and stuff)
Tornadoes can form anywhere in the world, but they form most often in regions with flat, dry terrain. Most devastating tornadoes form in Tornado Alley, a region of the Central United States that includes Northern Texas,Oklahoma, Kansas, and Nebraska.

How are the frequency and wavelength of electromagnetic waves related?

Answers

The frequency of electromagnetic wave is inversely proportional to the wavelength of the wave.

The speed of a wave is directly proportional to the wavelength of the wave.

v = fλ

where;

  • v is the speed of the wave
  • f is the frequency of the wave
  • λ is the wavelength

The frequency and wavelength of electromagnetic waves is related by the following equation as shown below;

v = f \lambda \n\nf= (v)/(\lambda)

Thus, we can conclude that the frequency of electromagnetic wave is inversely proportional to the wavelength of the wave.

Learn more here:brainly.com/question/19337414
Wavelength is the distance between two peaks of a wave and is usually measured in meters.  Frequency refers to the number of cycles a wave must produce to pass a point of origin in a second. Frequency is usually measured in Hertz.

A class of students is modeling how waves propagate through a medium. Each student in the class represents particle in the medium. An envelope represents the energy transferred by the wave. Which of the following scenarios would accurately model a wave propagating from one side of the room to the other?

Answers

C: "The students pass the envelope from one student to the next until it travels across the room."

To quote ck12, "The particles of the medium just vibrate in place. As they vibrate, they pass the energy of the disturbance to the particles next to them, which pass the energy to the particles next to them, and so on."
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