A funnel with a height of 3.56 inches is shown below.The funnel has a diameter of 1.38 inches that includes a wall that is 0.125 inches thick. What is the maximum volume of the funnel?

Question

anonymous · Answer

attachment

anonymous · Answer

So you have to find the volumes of the cones...

anonymous · Answer

i have to find whats the volume of the cone would be but the thing that is throwing me off is the thickness of the cone ...

anonymous · Answer

Well, I think it's the volume you have to find, so the volume of any cone with radius 'r' and height 'h' is 

V=πr^3h / 3

anonymous · Answer

v=1/3*pi*r^2*h i have the formula sheet right by me :) haha

anonymous · Answer

1.77= the volume of the whole thing

anonymous · Answer

Depending on what you use for pi (3.14) or (22/7) you get 1.77 or 1.78
These are the answers
A)1.19 in3 
B)1.78 in3 
C)0.76 in3 
D)3.57 in3

phi · Answer

diameter of 1.38 inches that includes a wall that is 0.125 inches thick.

|dw:1368626645955:dw|

a diameter of 1.38 means a radius of 1.38/2 = 0.69
but that includes the thickness of the wall.  the radius to the inside of the wall is less
it is 0.69-0.125
you should use this radius to find the volume of the cone:  r= 0.565