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Ugo [173]
3 years ago
13

Given: Q1 = +20 µc = 2.0 x 10-5 C

Physics
2 answers:
kicyunya [14]3 years ago
5 0
The answer is:  [C]:  0.60 N  .
____________________________________________
Explanation:  
__________________________________________________________
We use the formula / equation for "Coulomb's Law"; 
      to get the answer, in "N", ("Newtons") : 
__________________________________________________________

    F  =   (k * q1 * q2) / r²  ;
__________________________________________________________
         and plug in our values that are given in the problem to solve:
__________________________________________________________

F  =   (k * q1 * q2) / r²  ;   (Plug in the values): to get: 

    =  { [(9.0 * 10⁹ N·m² ) / C² ] * (2.0 * 10⁻⁵ C) * (3.0 * 10⁻⁵ C) } / { (3.0 m)² } ;
__________________________________________________________
     =   {9.0 * 10⁹ * 2.0 * 10⁻⁵ * 3.0 * 10⁻⁵ } / { (3.0²) }  N ; 
________________________________________________________
   {Note: "N" is the value in "Newtons", which we want.
            The other units "cancel out" to "1".   
     Note that anything multiplied by "1" equals that same value.
     Note that anything divided by "1" equals that same value.}.  We shall retain the "2" significant figures in our final answer;
________________________________________________________
So we have:
_____________________________________________________
     F = {9.0 * 10⁹ * 2.0 * 10⁻⁵ * 3.0 * 10⁻⁵ } / { (3.0²) }  N  ;
_____________________________________________________
     F   =  (5.4 / 9.0)  N  ;
_____________________________________________________
     F = 0.60 N ; which is:  Answer choice: [C].
_____________________________________________________
Feliz [49]3 years ago
3 0
<span>6.7 x 10-11....Have a good day with a big fat A+

</span>
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Use the mass spectrum of europium to determine the atomic mass of europium. where the peak representing eu-151 has an exact mass
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Abundance of Eu-153 atom:

X_{Eu-153}=\frac{1.000}{0.9161+1.000}=0.5219

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Answer:

Explanation:

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Amplitude A=?

When x = 0.7A

Using conservation of energy

∆K.E + ∆P.E = 0

K.E(final) — K.E(initial) + P.E(final) — P.E(initial) = 0

At the beginning immediately the hammer hits the mass, the potential energy is 0J, Therefore, P.E(initial) = 0J, so the speed is maximum.

Also, at the end, at maximum displacement, the speed is zero, therefore, K.E(final) = 0

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