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Allushta [10]
3 years ago
11

"Coal mines may contaminate groundwater in a location." What does this statement most likely represent?

Physics
2 answers:
Annette [7]3 years ago
8 0

Answer: an observation

Coal mining is a process of excavation of coal from the deeper layers of the earth crust. The mining process generally involves the unsaturated region but it adversely affect the saturated region, where groundwater reservoir is present. This results in the infiltration of the residues and sediments into the groundwater, hence contaminate it.

The given situation is an observation because it can be based upon facts and evidences.  


Aleks04 [339]3 years ago
5 0
By now ... 2018 ... after 200 years of experience and evidence,
it's an observation.
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3/4

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The electron dot diagram shows the arrangement of dots without identifying the element.
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2 years ago
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3 years ago
A capacitor is charged until its stored energy is 7.54 J. A second capacitor is then connected to it in parallel. If the charge
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Answer:

2 J

Explanation:

A charged capacitor of capacitance C_1 with energy of 7.54 J, is connected in parallel with another capacitor C_2 , so the charge is equally distributed between them.

(a) The energy stored in the capacitor before it being connected to the other capacitor is:

U_O=q_0^2/2C_1=7.54 J\\

The energy stored in the electric field is the sum of the energies of the two capacitors:

U=U_1+U_2\\U=q_1^2/2C_1+q_2^2/2C_2

since the charge equally distributed,  q_1 = q_2 = q_o/2. and since they are connected in parallel the potential difference on both of them is the same :

V_1=V_2\\q_1/C_1=q_2/C_2\\q_0/C_1=q_0/C_2\\C_1=C_2=C_3\\

hence,

U=q_0^2/8C+q_0^2/8C\\U=q_0^2/4C\\U=2J

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