All categories

3 years ago

Why might surface mining be less risky for miners than underground mining?

Physics

2 answers:

Marat540 [252]3 years ago

7 0

Answer:

Destruction of land, mine explosions, collapses and flooding surface subsidence,surface heaps

Explanation:

Surface mining might be less risky for miners than underground mining because of the following

1. Underground mining is more expensive than surface mining.It takes more time and energy to mine for coal in the underground

2. Destruction of land surfaces: Underground mining actually leads to the damage to landscape. The lands change form and topography due to the mining activities.

3. Surface subsidence,

4.Abandoned shafts and extensive surface spoil heaps,

5.Explosions: There is what is known as the triangle of fire. For a fire outbreak, there must be oxydant. fuel and ignition. Once these three are in place, an explosion can occur which can lead to loss of lives and equipments etc.

6. Collapses: Landslides might occur

due to tampering with the earth's layer during underground mining activities

7. Flooding: During underground mining, The table water can be be disrupted which might lead to flooding

aev [14]3 years ago

6 0

Surface miners work aboveground. (Apex) ^-^

You might be interested in

The fact that light travels at 300,000 km/s is a consequence of

Tresset [83]

<span>The fact that light travels at 300,000 km/s is a consequence of Energy Conservation
The particle that move with that kind of speed creates energy way faster than the particle that don't. Which means that it would require less effort to produce the energy,</span>

6 0

3 years ago

A car is traveling down the highway cruise control at 50m/s (this means its is traveling with a constant velocity NOT accelerati

lawyer [7]

Given parameters:

Speed of car = 50m/s

Time of travel = 5minutes (300s)

Unknown;

Distance of travel = ?

To solve this problem, we need to understand how speed relates with distance and time.

Speed is a physical quantity. It is the distance traveled divided by time taken.

Speed = $\frac{distance}{time}$

So,

Distance = speed x time

Input the parameters and solve for the distance;

Distance = 50m/s x 300s

Distance = 15000m

The distance covered during this time interval and speed is 15000m

3 0

3 years ago

What is the change in internal energy (deltaE ) of a system when it loses 76.0 J of heat while the surroundings perform 29.0 J o

lisabon 2012 [21]

Answer:

-47 J

Explanation:

Given that,

Heat loss = -76 J (negative for loss)

Work done by the surroundings = -29 J

We need to find the change in internal energy of a system.

The first law of thermodynamics is given by :

$\Delta U=Q-W$

W is work done by the system

Putting all the values,

$\Delta U=(-76)-(-29)\\\\=-47\ J$

Hence, the change in internal energy is -47 J.

3 0

3 years ago

A resin tube and a PVC rod are both rubbed against styrofoam. Do

Ivan

The concepts of electrostatics allow us to find the result for the question about the electric forces in the two tubes is:

The tubes are attracted by having charges of different signs.

<h3>Electrostatics</h3>

Electrostatics studies the transfer of charge between bodies when they rub together, in generating the charges of the insulating bodies they are not mobile, so to transfer them from one body to another they must be in contact.

The force electric between charges is of two types:

Attractive. If the charges are of different signs.

Repulsive. If the charges are of the same sign.

The transferred charge depends on the bodies involved in the tables showns that the resin is positively charged when rubbed, the PVC acquires very little charge and polystyrene acquires a negative charge due to rubbing.

They indicate that the resin is rubbed with polystyrene, therefore the resin must acquire a positive charge and the polystyrene a negative charge.

Then the PVC is rubbed with the polystyrene, which initially we will assume neutral, the PVC does not acquire a charge and the polystyrenes acquires a negative charge, if the polystyrene is isolated from the ground, it shares this negative charge with the PVC, therefore the two materials remain with half of the negative charge.

Finally, we bring the resin, which is positively charged, closer to the PVC, which has a slight negative charge, therefore the two bodies must attract each other.

In conclusion using the concepts of electrostatics we can find the result for the question about the electric forces in the two tubes is:

The tubes are attracted by having charges of different signs.

Learn more about electrostatics here: brainly.com/question/17692887

6 0

2 years ago

The rings of Saturn occupy the region inside Saturn's Roche limit.

Oliga [24]

I suppose this is a true or false question and that sentence is true.

7 0

3 years ago