Recent content by joebobjoe

Okay thanks. Calculus is stupid.

Why not? How does adding up the circumferences not equal the surface area of the dome.

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...