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Allushta [10]
3 years ago
14

From the illustration of the potassium atom, fill in the periodic table selection.

Physics
1 answer:
stich3 [128]3 years ago
3 0

Answer:

2 in shell 1; 8 in shell 2; 8 in shell 3 and 1 in shell 4 ; 19 total protons and electrons

Explanation: Potassium is in Group 1 Period 4 and will have 1 valence electron that is 4s1 electron configuration.

Atomic mass =

39.10  = 19 protons + 20 neutrons

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A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force)
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Answer:

<em>The velocity with which the student goes down the bottom of glide is 12.48m/s.</em>

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The Non conservative force is defined as a force which do not store energy or get he energy dissipate the energy from the system as the system progress with the motion.

Given are

   <em>  mass of the student 73 kg</em>

<em>      height of water glide 11.8 m</em>

<em>      work done as -5.5*10³ J</em>

Have to find speed at which the student goes down the glide.

According to<em> Law of Conservation of energy</em>,

          K.E =P.E+Work Done

 mv²/2=mgh +W

Rearranging the above eqn for v

v = √2(gh+W/m)

Substituting values,

V =  12.48 m/s.

<em>The velocity with which the student goes down the bottom of glide is 12.48m/s.</em>

 

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