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enot [183]
3 years ago
10

When a 12 newton horizontal force is applied to a box on a horizontal

Physics
1 answer:
sdas [7]3 years ago
6 0

Answer:

ur mum

Explanation:

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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
2 years ago
A ball is kicked from the origin with an initial speed of 10 = 25.0 /, at an angle with
pav-90 [236]

Answer:

2.5                  2.566335 sec

Explanation:

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2 years ago
The intensity of a 70-dB whistle is quintupled. What is the new decibel level
hoa [83]

Multiplying the power of any signal by 5 can be described as
an increase of  6.99 dB .

If the whistle blew at 70 dB initially, and its sound power became
multiplied by 5, and the whistle and the listener both stayed in
the same places, then the listener would tell you that the whistle
was now blowing at 76.99 dB .

(More likely, he would report "77 dB" as he held his ears and winced.)

7 0
3 years ago
When was hawaii volcanoes national park established
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1906 i Believe..........
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A object travels at constant negative acceleration. What does the graph of the object's velocity as a fun
melomori [17]
Constant = straight line
“Travels at constant negative acc.”
Which is negative slope

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