Grinder Sanding
Can someone help me with this math problem?? please!?
Can someone explain in detail how to solve this math problem. please?
Sand poured from a grinder forms a conically shaped pile. When the pile is 28 feet in diameter and 12 feet high, how many cubic yards of sand are in the pile?
The volume of a cone is 1/3(Area of Base)(height) = 1/3(pi*r^2)(height).
so you have pi (3.1416), the radius of the base is the r (radius is half of the diameter, so r =14), and the height is 12 feet
The volume is 1/3(3.1416×14^2)x(12)=2463 cubic feet. They want your answer in yards so a cubic yard is 3ftx3ftx3ft or 27 cubic feet. Divide 2463 by 27 to get your cubic yards, approximately 91.22
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Flexible Rubber Backing Pad 115mm use with sanding disc 4 1/2″ grinder sander £3.95 |
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Tutorial – Metal Pipe Polishing – Using JOST Sanding System & Angle Grinder