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BartSMP [9]
3 years ago
5

which change is the best example of a physical change 1) a cookie baking 2) paper burning 3) ice cream melting 4) a nail rusting

Physics
1 answer:
vfiekz [6]3 years ago
3 0
Hey there! :D

We want to find an answer choice that is reversible. If the physical change could have some way of being fixed, then it is a physical change. If it is a chemical change, the make-up is different and there is no way that it could change. 

A cookie baking cannot be reversed. Cookies cannot go back to being cookie dough. 

Paper burning cannot be reversed. Ashes and smoke cannot go back to being paper. 

However, if your ice cream melts, you can refreeze it. Therefore, "3" is the best answer to the question. 

I hope this helps!
~kaikers 


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Answers are - <br><br>A 235 N<br><br>B 376 N<br><br>C 271 N<br><br>D 188 N<br><br>E 470 N
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A thin spherical shell of radius R has a total charge +Q uniformly distributed over its surface. Of the following distance r fro
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Answer:

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Explanation:

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         Φ._{E} = ∫ E. dA = q_{int} / ε₀

For this case we create a Gaussian surface that is a sphere.  We can see that the two of the sphere and the field lines from the spherical shell grant in the direction whereby the scalar product is reduced to the ordinary product

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The area of ​​a sphere is

     A = 4π r²

   

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    E = (1 /4πε₀ )  q / r²

Having the solution of the problem let's analyze the points:

A   ) r = 3R / 4  = 0.75 R.

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B) r = 5R / 4 = 1.25R

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    E = (1 /4πε₀ )  Q / (1.25R)²

    E = (1 /4πε₀ )  Q / R2 1 / 1.56²

    E₀ = (1 /4π ε₀ )  Q / R²

   E_{B} =  Eo /1.56 ²

  E_{B}  = 0.41 Eo

C) r = 2R

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    E_{B} =(1 /4π ε₀ ) Q    1/(2R)²

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    E_{B} = 0.25 Eo

D) False the field changes with distance

The correct answer is B

4 0
3 years ago
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