Why does weight decreases in coal mine?

The weight of a body in a coal mine is less than that at the surface of the Earth because in the coal mine there are also part of the Earth attracting the body upward. The upward force of the upper portion of the Earth and the downward force of the lower portion of the Earth will effectively subtract from each other.

What happens to the weight of the body if the weight becomes 1 16?

So, we have, Case I: When the body is on the ground, that is, the height is zero. The height at which the weight of a body becomes\[\dfrac{1}{16}th\], its weight on the surface of the earth (radius R), is 3R. So, the correct answer is “Option A”.

Is weight lower on mountains than at sea level?

But generally speaking, gravitational pull, and therefore weight, is lower on a mountain than at sea level, says Bell. So, what would happen to gravitational pull if you travelled below that the Earth’s surface towards the centre?

Does mining use less land than solar and wind?

When measured as a snapshot in time, land used for mining coal ( 0.09 acres per GWh) and uranium ( 0.06 acres per GWh) uses less land than solar ( 3 acres per GWh) and wind ( 26 acres per GWh ). So, when you include mining, does this confirm that fuel-based land use is still the most productive?

What is the purpose of benching in coal mining?

Its purpose is to automatically compensate for any slack in the belting created by start-up, etc. Bench – One of to or more divisions of a coal seam separated by slate or formed by the process of cutting the coal. Beneficiation- The treatment of mined material, making it more concentrated or richer.

What are two environmental problems associated with abandoned coal mine sites?

.7 times 80 million is 56 million Describe TWO environmental problems that are associated with abandoned coal mine sites. Heavy metal runoff; habitat destruction Describe one method that can be used to mitigate one of the problems you identified. Plant trees to recover habitat