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

Physics

2 answers:

Annette [7]2 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]2 years ago

5 0

By now ... 2018 ... after 200 years of experience and evidence,
it's an observation.

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A person is standing on and facing the front of a stationary skateboard while holding a construction brick. The mass of the pers

jek_recluse [69]

Answer:

0.74 m/s

Explanation:

From the question,

We apply the law of conservation of momentum,

Total momentum before collision = Total momentum after collision.

Since the skateboard, the person and the brick where stationary, therefore, the total momentum before collision is 0

0 = Total momentum after collision

(m+M)V + m'v = 0

Where m = mass of the skateboard, M = mass of the person, m' = mass of the brick, V = recoil velocity of the person and the skateboard, v = velocity of the brick

make V the subject of the equation above

V = -m'v/(m+M)................... Equation 1

Given: m = 4.10 kg, M = 68.0 kg, m' = 2.50 kg, v = 21.0 m/s.

Substitute these values into equation 1

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