A cable that weighs 4 Ib/ft is used to lift 800 lb of coal up a mine shaft 650 ft deep. Find the work done.
Optimization
Optimization comes from the same root as "optimal". "Optimal" means the highest. When you do the optimization process, that is when you are "making it best" to maximize everything and to achieve optimal results, a set of parameters is the base for the selection of the best element for a given system.
Integration
Integration means to sum the things. In mathematics, it is the branch of Calculus which is used to find the area under the curve. The operation subtraction is the inverse of addition, division is the inverse of multiplication. In the same way, integration and differentiation are inverse operators. Differential equations give a relation between a function and its derivative.
Application of Integration
In mathematics, the process of integration is used to compute complex area related problems. With the application of integration, solving area related problems, whether they are a curve, or a curve between lines, can be done easily.
Volume
In mathematics, we describe the term volume as a quantity that can express the total space that an object occupies at any point in time. Usually, volumes can only be calculated for 3-dimensional objects. By 3-dimensional or 3D objects, we mean objects that have length, breadth, and height (or depth).
Area
Area refers to the amount of space a figure encloses and the number of square units that cover a shape. It is two-dimensional and is measured in square units.
![### Work Done in Lifting Coal Up a Mine Shaft
A cable that weighs 4 lb/ft is used to lift 800 lb of coal up a mine shaft that is 650 ft deep. We need to determine the work done to lift the coal.
#### Riemann Sum Approximation
To approximate the required work, we use a Riemann sum. Here, \( x \) represents the distance in feet below the top of the shaft, and \( x_i^* \) as \( x_i \). The Riemann sum for the given problem can be expressed as:
\[
\lim_{n \to \infty} \sum_{i=1}^n \left( 800 + 6x_i \right) \Delta x
\]
#### Expression as an Integral
This Riemann sum can be expressed as an integral:
\[
\int_{0}^{650} \left( 800 + 6x \right) \, dx
\]
#### Evaluation of the Integral
To find the total work done, we evaluate the integral:
\[
\int_{0}^{650} \left( 800 + 6x \right) \, dx = 1787500 \, \text{ft-lb}
\]
Therefore, the total work done in lifting the coal up the mine shaft is \( 1787500 \, \text{ft-lb} \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc6324356-2557-447f-b3ba-fab9095c7f57%2Fbb2932ee-356b-40de-94ac-2557a2f0aa58%2Fw8dcppu.png&w=3840&q=75)
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