PHYSICS HIGH SCHOOL

A 4-kilogram ball moving at 8 m/sec to the right collides with a 1-kilogram ball at rest. After the collision, the 4-kilogram ball moves at 4.8 m/sec to the right. What is the velocity of the 1-kilogram ball?

Answers

Answer 1
Answer: Conservation of momentum: total momentum before = total momentum after

Momentum = mass x velocity

So before the collision:
4kg x 8m/s = 32
1kg x 0m/s = 0
32+0=32

Therefore after the collision
4kg x 4.8m/s = 19.2
1kg x βm/s = β
19.2 + β = 32

Therefore β = 12.8 m/s

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A solution is measured to have a pH of 2.3. What is most likely also true about the solution?1.)It has a low hydroxide ion concentration.
2.)It has a low hydronium ion concentration.
3.)It is neutral.
4.)It has no H2O molecules.

Answers

According to the pH scale, a solution that has a pH of < 7 is considered an acid. Since it is established that the solution is an acid, there will be a low OH- concentration (hydroxide ion) in solution. In terms of hydronium ion, an acid has a higher amount of hydronium ion concentration.

Answer:

the answer is A

Explanation:

took my segment exam!!

Which of these statements is true? A.
Some molecules may contain no atoms.


B.
Some elements found in nature exist as molecules.


C.
Some compounds include only one type of element.


D.
Some atoms are made of two or more different elements.

Answers

B). Some elements found in nature exist as molecules. 
That is, their atoms travel around in bound pairs. 
Examples are Hydrogen, Oxygen, and Nitrogen.

A). No.  Without atoms, you can't make a molecule.

C). No.  A compound is a chemical combination of two or more elements.

D). No.  An atom is the smallest unit of ONE single element.

Hello, your answer is, C. Some compounds include only one type of element.

I hope it helped!

In any one material, all electromagnetic waves have the samea. wavelength.
b. velocity.
c. frequency.
d. amplitude.

Answers

Penn foster Students:  Velocity

A book is resting on a table. The table is raised on one end to an angle of 15° to the floor. If the book remains at rest, what keeps the book from sliding

Answers

Answer:

Static Friction is acting upon the book

Sandra's target heart rate zone is 135bpm—172bpm. Marissa's target heart rate zone is 143bpm—176bpm. They stop playing basketball and take their pulse, and both count the heart rate at 144bpm. If they decrease their heart rates by 20bpm, who will be in her THR zone?

Answers

Answer: Neither Sandra nor Marissa will be in her THR zone.


Explanation:


1) Actual pulse of both Sandra and Marissa : 144 bpm


2) Decrease of 20 bpm ⇒ 144 bpm - 20 bpm = 124 bpm


3) Sandra's TRH is in the range 135 - 172 bpm.


Since 124 < 135, she will be below the range.


4) Marissa's TRH range is 143 - 176 bpm.


Since, 124 < 143, she is below the range


In conlusion, neither Sandra nor Marissa will be in her THR zone.


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it will be 124 bpm.  Her TRH is the range  of 135 - 172 bpm,
so she will be below it.

Marissa's pulse is 144 bpm.  If she decreases it by 20 bpm,
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so she will be below it.

Neither girl will be in her THR.

When you sit indoors near a window on a sunny day your skin gets warm how does this happen?F. The Suns energy reaches your skin as radiation.
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I. Heat from the room is reflected from the Windows onto your skin

Answers

Well, we know it's NOT I., because only LIGHT gets reflected.
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So that leaves only to A., and YES, it could reach our skin through radiation!
I hope I helped! =D
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