







Roll of film 
20211120 

Brian pose la question : Trying to create a formula to calculate the build up on a roll of film is calculated. Except instead of of a roll, it's essentially a rectangle with two semicircles on each at the end.
Example: I start with a 6" diameter core on each side, and I start winding .005"
thick film on the core. The distance between the center of those cores, length of the inner rectangle is 7.125.
If I continue to do this for a total length of film of 3000 feet, what will the
roll length and width be.
So what I need is the formula to perform this type of calculation.
Can you help me? I want to be able to plug the formula in a spread sheet and to be able to input a core diameter, a film thickness and a total length and the length between the center of the two cores(which is the inner rectangle's length I'm assuming).
Thanks Harley Weston lui répond. 





An octagonal drum 
20210511 

Louie pose la question : I teach carpentry on an Indian reservation.
My students want to make an 18 inch drum frame.
They want to have 8 sides or an octagon shape to the drum frame.
What angle I have to set my miter saw to cut the angles to fit the octagon together.
I want to use this formula by changing the diameter of the frame.
Harley Weston lui répond. 





A cylindrical drum 
20190210 

Ronald pose la question : I have a cylinder that is 32 inches round by 25 inches deep how much water can it hold Penny Nom lui répond. 





Volume of liquid remaining in a tilted cylinder 
20161108 

Brian pose la question : I am trying to determine the amount of a liquid remaining in a 55 gallon drum when it is tilted at 45 degrees and the liquid level is low enough so that the liquid does not completely cover the bottom of the drum.
Your help is greatly appreciated. Harley Weston lui répond. 





Painting 400 drums 
20121005 

Jordan pose la question : This cylinder is given:
Cylinder with a height of 84 cm and a diameter of 54 cm.
Question: The exterior of the drum (cylinder), except the base, is to be painted blue. calculate how many litres of paint will be needed to paint 400 drums if one litre of paint covers 8.8meters Squared.
Answer to nearest tenth of a litre. Harley Weston lui répond. 





\mbox 
20121005 

Jordan pose la question : This cylinder is given:
Cylinder with a height of 84 cm and a diameter of 54 cm.
Question: The exterior of the drum (cylinder), except the base, is to be painted blue. calculate how many litres of paint will be needed to paint 400 drums if one litre of paint covers 8.8meters Squared.
Answer to nearest tenth of a litre. Harley Weston lui répond. 





Liquid in a drum 
20081110 

RAY pose la question : How can I determine the exact amount of liquid in an overturned drum? Penny Nom and Victoria West lui répond. 

