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mariarad [96]
3 years ago
7

Two Force one of 12 Newton and another 24 Newton acts at 90 degree with each other find the resultant of two force and its direc

tion
​
Physics
1 answer:
Leona [35]3 years ago
3 0

Answer:

Fr = 26.83 [N]

Explanation:

To solve this problem we must use the Pythagorean theorem, since the forces are vector quantities, that is, they have magnitude and density. Therefore the Pythagorean theorem is suitable for the solution of this problem.

F_{r}=\sqrt{(12)^{2}+(24)^{2}  } \\F_{r}=26.83[N]

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Using arrangement (a), how many rb atoms could be placed on a square surface that is 9.5 cm on a side? the diameter of a rubidiu
Leviafan [203]

Part a

Answer: 3.64\times10^{16}

For the arrangement considered in part a, all the atoms are aligned side by side along the side of the square surface.

Along one side of the square, the number of atoms that could fit =\frac {length\hspace{1mm}of\hspace{1mm}side}{diameter\hspace{1mm}of\hspace{1mm}atom}=\frac{9.5\times10^{-2}m}{4.95\times10^{-10}m}=1.91\times10^8 atoms

This is along one side. On the entire surface:

Number of atoms = (1.91\times10^8 )^2=3.64\times10^{16} atoms

Part b

Answer: 4.23\times10^{16}

consider the attached figure below:

The next layer of atoms are filled in the depressions of the first layer. The vertical distance between the two atoms would change. Consider an equilateral triangle drawn by joining the centers of the three atoms.

The atoms along the horizontal side would be aligned side by side; same as above =1.91\times10^8 atoms

The number of atoms along vertical side would vary. vertical distance between two atoms can be calculate using equilateral triangle as shown below.

an equilateral triangle has all the angles = 60^o

Let the vertical distance be y.

Then, y = 2r sin60^o

where r is the radius of each atom. 2r= 4.95\times10^{-10} m

y=4.95\times10^{-10} m\times sin60^o=4.28\times10^{-10} m

The number of atoms along the vertical side = \frac{9.5\times10^{-2}m}{4.28\times10^{-10}m}=2.21\times10^8 atoms

Total number of atoms in this kind of arrangement = 1.91\times10^8\times2.21\times10^8=4.23\times10^{16} atoms


6 0
3 years ago
What is heat energy!? ​
nordsb [41]

Answer:

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Explanation:

hope this helps

5 0
3 years ago
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777dan777 [17]

Explanation:

Given that,

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If distance 2, r' = 25 m

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I=\dfrac{P}{4\pi r^2}.........(1)

Let I' is the intensity at r'. So,

I'=\dfrac{P}{4\pi r'^2}............(2)

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I'=\dfrac{Ir}{r'^2}

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3 years ago
Why society might initially reject a new scientific theory?
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I was about to say:  because people generally get comfortable with
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But then I thought about it a little bit more, and I have a different answer.

"Society" might initially reject a new scientific theory, because 'society'
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Second, let's face it.  The main ingredient that comprises 'Society' ... people ...
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There may be very good reasons that some particular a new scientific theory
should be rejected, or at least seriously questioned.  But believe me, 'Society'
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That's pretty much why.
 
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They are fused in the core of the star due to great pressures and temperatures.  They are made all the way through iron.  At that point the star dies.  If it is a really large star it will become a supernova when it dies, creating all of the elements beyond iron as well, but only in its death.  No star can create anything beyond iron in its life cycle
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