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goblinko [34]
3 years ago
11

How many electrons do alkali metals have in their outer shell?

Physics
2 answers:
DIA [1.3K]3 years ago
6 0
These metals have only one electron<span> in their outer shell. Therefore, they are ready to lose that </span>one electron<span> in ionic bonding with other elements. #stay smoking

</span>
BARSIC [14]3 years ago
3 0
The outer shell can hold 1 electron
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Why do you think fixed boundaries ""flip"" waves and loose boundaries do not?
Vinil7 [7]

Answer:

When the obstacle is fixed, the law of action and reaction, makes the reflected wave is inverted.

When the obstacle is mobile, he mobile point, it moves in the direction of the wave, therefore there is no inversion of it.

Explanation:

Waves when they reach an obstacle behave like a shock, therefore if we use the conservation of momentum the wave must reverse its speed, this explains that the speed changes sign, the wave is reflected.

When the obstacle is fixed, the wave when it reaches the obstacle exerts a force on the point, by the law of action and reaction the point exerts on the wave a force of equal magnitude but in the opposite direction, this reaction force which makes the reflected wave is inverted.

When the obstacle is mobile, this is without friction, when the wave arrives it exerts a force on the mobile point, it moves in the direction of the wave, reaching the maximum amplitude of the incident wave, when it is reflected the point begins to go down along with the wave, therefore there is no inversion of it.

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2 years ago
I.Name two commonly used thermometric liquids.
PtichkaEL [24]

Answer:

mercury and alcohol

ii) used to test temperatures

6 0
3 years ago
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A mechanic needs to replace the motor for a merry-go-round. The merry-go-round should accelerate from rest to 1.5 rad/s in 7.0 s
marta [7]

Answer

given,

initial speed of merry-go-round = 0 rad/s

final speed of merry-go-round = 1.5 rad/s

time = 7 s

Radius of the disk = 6 m

Mass of the merry-go-round = 25000 Kg

Moment of inertia of the disk

I = \dfrac{1}{2}MR^2

I = \dfrac{1}{2}\times 25000\times 6^2

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angular acceleration

\alpha = \dfrac{\omega_f-\omega_0}{t}

\alpha = \dfrac{1.5-0}{7}

\alpha =0.214\ rad/s^2

we know,

\tau= I \alpha

\tau= 450000\times 0.214

\tau=96300\ N.m

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3 years ago
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Three of the statements are true.  'D' is false.
Glass and rubber are excellent insulators, total duds as conductors.
8 0
3 years ago
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When a puddle of water evaporates, does the water change into a new kind of matter
PIT_PIT [208]
Evaporated water changes form into gas
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3 years ago
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