Well according to page 78 of http://www.slideshare.net/mrsbeth63/engineering-mechanics-statics-rc-hibbeler-12th-edition-complete-solutions-ch-9" , the answer is 1365 m^2. I kind of understand how they did it, I just want to know why my way doesn't work.
Homework Statement
Determine the surface area of the roof of the structure if it is formed by rotating the parabola about the axis.
Homework Equations
SA=\int _0^{16}{2\pi\left ( 4 \sqrt{16-y} \right ) dy} (?)
The Attempt at a Solution
SA=\left [ -\frac{16}{3}\pi\left ( 16-y...
Homework Statement
Supposed to support a 50 kN weight at a pin joint at the center of a void as cost effectively as possible using trusses (e.g., trusses and pin joints have costs)
Homework Equations
Basic sum of moments and sum of forces = 0
The Attempt at a Solution
Why can't I...
(Since this is a coursework question and not a homework question, I deleted the template)
Both my chemistry and physics textbooks cite cathode rays as having the ability to excite or eject electrons from an atom (e.g., dielectric breakdown, x-ray spectroscopy). How can a stream of negatively...