Define
as the region bounded above by the graph of
and below by the
over the interval
Find the volume of the solid of revolution formed by revolving
around the line
For our final example in this section, let’s look at the volume of a solid of revolution for which the region of revolution is bounded by the graphs of two functions.
A region of revolution bounded by the graphs of two functions
Define
as the region bounded above by the graph of the function
and below by the graph of the function
over the interval
Find the volume of the solid of revolution generated by revolving
around the
First, graph the region
and the associated solid of revolution, as shown in the following figure.
Note that the axis of revolution is the
so the radius of a shell is given simply by
We don’t need to make any adjustments to the
x -term of our integrand. The height of a shell, though, is given by
so in this case we need to adjust the
term of the integrand. Then the volume of the solid is given by
Define
as the region bounded above by the graph of
and below by the graph of
over the interval
Find the volume of the solid of revolution formed by revolving
around the
We have studied several methods for finding the volume of a solid of revolution, but how do we know which method to use? It often comes down to a choice of which integral is easiest to evaluate.
[link] describes the different approaches for solids of revolution around the
It’s up to you to develop the analogous table for solids of revolution around the
Let’s take a look at a couple of additional problems and decide on the best approach to take for solving them.
Selecting the best method
For each of the following problems, select the best method to find the volume of a solid of revolution generated by revolving the given region around the
and set up the integral to find the volume (do not evaluate the integral).
The region bounded by the graphs of
and the
The region bounded by the graphs of
and the
First, sketch the region and the solid of revolution as shown.
Looking at the region, if we want to integrate with respect to
we would have to break the integral into two pieces, because we have different functions bounding the region over
and
In this case, using the disk method, we would have
If we used the shell method instead, we would use functions of
to represent the curves, producing
Neither of these integrals is particularly onerous, but since the shell method requires only one integral, and the integrand requires less simplification, we should probably go with the shell method in this case.
First, sketch the region and the solid of revolution as shown.
Looking at the region, it would be problematic to define a horizontal rectangle; the region is bounded on the left and right by the same function. Therefore, we can dismiss the method of shells. The solid has no cavity in the middle, so we can use the method of disks. Then
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life