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2 years ago

5

A scientist is studying a sample of matter the matter has no definite shape or volume and it can conduct an electric current. Th

e sample is most likely in which of the following states
A.solid
B.Liquid
C.gas
D.plasma

2 answers:

boyakko [2]2 years ago

7 0

it will be d hope i help

Anna35 [415]2 years ago

4 0

D. plasma ..................

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IF a rock has a mass of 92,224 kg, what is it's weight?

KATRIN_1 [288]

Answer:

904 717.44 N

Explanation:

The mass of an object is a fundamental property of the object.

The weight of an object is the force of gravity on the object.

This is defined as follows

Weight (W)= mass(m) × weight of a unit mass(g)

( gravitational field intensity = g)

assume g =9.81 m/s2

weight = 92 224 * 9.81

= 904 717.44 N

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3 years ago

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 $= 1.91\times10^8\times2.21\times10^8=4.23\times10^{16} atoms$

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2 years ago

A car is traveling around a horizontal circular track with radius r = 210 m at a constant speed v = 23 m/s as shown. The angle θ

Fantom [35]

Centripetal acceleration of car is given by formula

$a_c = \frac{v^2}{R}$

now plug in the values in this

$a_c = \frac{23^2}{210}$

$a_c = 2.52 m/s^2$

Part b)

At position A we have

x component of acceleration is given as

$a_x = -a_c cos23$

$a_x = -2.32 m/s^2$

Part c)

At position A we have

y component of acceleration is given as

$a_y = -a_c sin23$

$a_y = -0.98 m/s^2$

Part d)

At position B we have

x component of acceleration is given as

$a_x = -a_c cos53$

$a_x = -1.52 m/s^2$

Part e)

At position B we have

Y component of acceleration is given as

$a_y = a_c sin53$

$a_y = 2.01 m/s^2$

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3 years ago

What does the atomic number of an atom tell us?

Trava [24]

Answer:

the number of protons in the atom.

Explanation:

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2 years ago

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You compress a spring by a distance of 0.2 m. The spring has a spring constant of 37 N/m. When you release the spring, it snaps

Serggg [28]

At that point it is no longer trying to uncompress nor is it trying to stretch. This is the same thing as a pendulum at the bottom of its swing, no longer falling but not yet rising against gravity. Thus the kinetic energy there is the same as the potential energy when it is compressed. The energy of compression is
$\frac{1}{2}k x^{2}$
This gives E=0.5(37)(0.2)²=0.74J
This is the same as the kinetic energy when it is at natural length

7 0

3 years ago

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