area of an equilateral triangle with side length "s" is
since the base runs from to ,
second one has square cross-sections ... same idea as above.
Hello, I have a two problem in which I find difficult to understand.
Basically, it's the wording of the problems that's confusing the heck out of me. I have no problem with these types of problems in general so if a good Samaritan could kindly translate these problem into simpler terms for me I'd be extremely thankful. I can't help but think there's an easier way to write these.
1] Set up and evaluate the definite integral to find the volume of the solid between two planes perpendicular to the x-axis at x=0 and x=4. The cross sections perpendicular to the x-axis between these planes are equilateral triangles whose bases run from y=3sqrt(x) and y=-2x.
2] Setup and evaluate the definite integral to find the volume of the solid between the planes perpendicular to the x-axis at x=-1 and x=2. The cross sections perpendicular to the x-axis between these planes are squares whose bases run from y=x^2 and y=x+2.
Thanks in advance!
The area of an equilateral triangle is1] Set up and evaluate the definite integral to find the volume of the solid between two planes perpendicular to the x-axis at x=0 and x=4. The cross sections perpendicular to the x-axis between these planes are equilateral triangles whose bases run from y=3sqrt(x) and y=-2x.
Where y is the length of a side. You have to use this formula along with your functions. The side is made up of the region between the graphs of the two given functions.
Can you envision what is going on?. Here is a graph. Picture the triangles stacked up along the shaded region perp. to the x-axis.
I just did problem #1 and was wondering if someone could double check for me? The words are still confusing me.
1] V = Integral(0,4) Sqrt(3)/4 s^2 dx
s = 3sqrt(x) - (-2x)
V = Sqrt(3)/4 *Integral(0,4) 9x+12x^3/2+4x^2 dx
V = Sqrt(3)/4 *[(9x^2)/2 + (24x^5/2)/5 + (4x^3)/3] (0,4)
V = Sqrt(3)/4 *[(9(4)^2)/2 + (24(4)^5/2)/5 + (4(4)^3)/3] - 0
V = Sqrt(3)/4 *[72 + 768/5 + 256/3]
V = Sqrt(3)/4 *[4664/15]
V = 1166Sqrt(3)/15