FORMULA SHELF
2 of 370
The arithmetic behind the work: what to measure, what to type in, and what the answer comes out as. Every formula says what the symbols mean and gives a worked example, so you can check it against a job you have already done.
SHELVES
Maths
1 formulas
Feed price moves, growth rate, water use, milk yield, a price rise at the mart. Always state the direction with a sign.
Feed went from 220 to 260 a tonne: (40/220) x 100 = 18.2% more.
Convenience only. Double-check the result against the worked example or a second method before you use it.
Physics
1 formulas
The stiffness of a material. Steel is nearly twenty times stiffer than oak, which is why a steel frame sags less and lasts longer than a timber one of the same size.
A 10 mm steel bar pulled by 5 kN across 78.5 mm2 = 64 MPa.
Convenience only. Double-check the result against the worked example or a second method before you use it.
SOURCES & PROVENANCE
1 listed
This page is an AI-organised index. The label means the grouping and cross-links were compiled with AI; the information itself comes from the public-domain books, reports and manuals listed below. Open any source to read the local copy or follow the link to the original publication.