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iVinArrow [24]
3 years ago
15

Two identical objects are moving directly toward one another at the same speed v. ~v â~v m m what is the total kinetic energy of

the system of the two objects?
Physics
1 answer:
Tresset [83]3 years ago
3 0
If they are identical, then their masses are the same. The speeds are the same. KE has no direction.
Total KE = 1/2 m v^2 + 1/2 mv^2 = mv^2

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What is the magnitude of the electric force between a proton and an electron when they are at a distance of 4.09 angstrom from e
Zinaida [17]

Answer:

F=1.38*10^{-9}N

Explanation:

According to Coulomb's law, the magnitude of the electric force between two point charges is directly proportional to the product of the magnitude of both charges and inversely proportional to the square of the distance that separates them:

F=\frac{kq_1q_2}{d^2}

Here k is the Coulomb constant. In this case, we have q_1=-e, q_2=e and d=4.09*10^-10m. Replacing the values:

F=\frac{8.99*10^{9}\frac{N\cdot m^2}{C^2}(-1.6*10^{-19}C)(1.6*10^{-19}C)}{(4.09*10^{-10})^2}\\F=-1.38*10^{-9}N

The negative sign indicates that it is an attractive force. So, the magnitude of the electric force is:

F=1.38*10^{-9}N

5 0
3 years ago
Which of the following best states the difference between a description and an explanation? A. A description is a statement that
rjkz [21]
It is C. A description goes into the details about something, and an explanation is a statement that clarifies something, generally a question.
8 0
3 years ago
Converted to<br> Energy<br> Electricity powers the lights<br> for a building.
Slav-nsk [51]

Answer:

More than enough solar energy (8.2 million quad BTUs, 1 quad = 2.9 x1011 kWh) hits Earth's surface each year to meet all of societies' needs. Currently we use about 400 quads per year to run our society. Good building design allows passive use of sunlight to heat homes. Simple solar collectors are used to heat water and cook food. As useful as it is for these purposes, thermal energy from sunlight is still a low quality energy compared to electricity. Computers, most machinery, light bulbs, subway trains, and much more all require electricity. It is possible to turn thermal energy from the sun into electricity. In this unit we will examine how.

. We will also examine how to make electricity directly from light using the photovoltaic cells.

6 0
3 years ago
Plants grow over time by balancing two chemical reactions: photosynthesis and cellular respiration. Plants use the products of p
Andreyy89
The answer to that I think would be D because:

A is wrong because it doesn't make sense the way the order it is in,

B doesn't make sense because it is in the wrong order,  and

C says the same exact thing that photosynthesis says which would mean that it is representing the photosynthesis equation not the chemical equation for cellular respiration.

Also it is D because D shows the correct way that the chemical equation representing cellular respiration is supposed to be in.

Hope this helped!

8 0
3 years ago
If you were to mix 7 grams of sugar into 100 grams of water, how much should the total mass of the solution be?
inn [45]

Answer:

<em>The total mass of the solution should be 107 grams</em>

Explanation:

<u>Solutions</u>

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent. The solute is the substance that is being dissolved, while the solvent is the dissolving medium.

The relationship between the masses is:

m_s=m_o+m_v

Where:

ms = mass of the solution

mo = mass of the solute

mv = mass of the solvent

If you were to mix mo=7 gr of sugar into mv=100 gr of water, then the total mass of the solution should be:

m_s=7~gr+100~gr

m_s=107~gr

The total mass of the solution should be 107 grams

8 0
3 years ago
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