thanks for the video but in the last steps you lost me when the X^2 disappeared from the right-hand side formula. You introduced an r^2 to both sides all of sudden.
Plus how you made the last bracket Positive isnt all good. All good.
All you kids need to no is anti derivatives, integration i suggest this video watch?v=TospO7-aoiw
@msumurph Hello! I understand the method of slicing to find the volume of the sphere. But, I cannot extend the same to find the surface area of the sphere (The incorrect solution is pi^2*r^2). Although I was able to find the correct surface area (taking infinitesimal length of arc 'ds' instead of 'dx'), I am not able to understand:
1. Why use 'dx' to get sliced area Ax = 2*pi*y*dx and 'not' use 'ds' to get sliced area Ax = 2*pi*y*ds?
2. Why use 'ds' to get sliced circumference Cx = 2*pi*y*ds?
Okay, perhaps I was a little harsh on him. But that still doesn't mean it took him an auwful lot of time to find the volume of a sphere with what probably is the easiest way of calculating it.
I was a little rude too...sorry. But you need to remember that most of the people who make these kinds of are making them out of the kindness of their hearts, so while perhaps this did not help you, it did not hurt you since all the information is correct. Plus, it helped others. So if you want nice people to continue to make these kinds of videos for us then I think it would be best to either be supportive or give CONSTRUCTIVE criticism.
thanks for the video but in the last steps you lost me when the X^2 disappeared from the right-hand side formula. You introduced an r^2 to both sides all of sudden.
Plus how you made the last bracket Positive isnt all good. All good.
All you kids need to no is anti derivatives, integration i suggest this video watch?v=TospO7-aoiw
Kayse2010 7 months ago
your r kinda looks like an n
shylildude 1 year ago
Nice Job
michalchik 1 year ago
can you please tell me how did you find the value of y^2 ?? You kinda jumped without explaining that
SuperSurreptitious 1 year ago
@SuperSurreptitious The cross-section is a circle with radius y. The area of the cross section is pi*y^2. Then we write the y^2 in terms of x.
msumurph 1 year ago
ty very much that was very helpful
barbieskid 2 years ago
HOLY SMOKES, you saved me, that was SO helpful!
juicywednesday 2 years ago 2
@juicywednesday Glad it helped!
msumurph 2 years ago
@msumurph Hello! I understand the method of slicing to find the volume of the sphere. But, I cannot extend the same to find the surface area of the sphere (The incorrect solution is pi^2*r^2). Although I was able to find the correct surface area (taking infinitesimal length of arc 'ds' instead of 'dx'), I am not able to understand:
1. Why use 'dx' to get sliced area Ax = 2*pi*y*dx and 'not' use 'ds' to get sliced area Ax = 2*pi*y*ds?
2. Why use 'ds' to get sliced circumference Cx = 2*pi*y*ds?
ypai1985 7 months ago
@msumurph By the way, ds = sqrt[(dy)2+(dx)2] = dx*sqrt[1+(dy/dx)2]
ypai1985 7 months ago
thanks man! this is a great help!
neoalexan 2 years ago
Man, you're LAME. You like stuck for 10 times.
Diemedes 2 years ago
@Diemedes
Your RUDE.
And this video is AWESOME!
Lots of help if only I had seen it before the test...that rude kid is just jealous of your mad math skills. Trust me.
lemongrassmari 11 months ago
@lemongrassmari
Okay, perhaps I was a little harsh on him. But that still doesn't mean it took him an auwful lot of time to find the volume of a sphere with what probably is the easiest way of calculating it.
Diemedes 11 months ago
@Diemedes
I was a little rude too...sorry. But you need to remember that most of the people who make these kinds of are making them out of the kindness of their hearts, so while perhaps this did not help you, it did not hurt you since all the information is correct. Plus, it helped others. So if you want nice people to continue to make these kinds of videos for us then I think it would be best to either be supportive or give CONSTRUCTIVE criticism.
lemongrassmari 11 months ago
TAURUSES!!!!!!!!!!!!!!
AHHHA NOOO!
I should fail the bc exam to retake and ace calc1 in college
Ethkingg 3 years ago