Recent content by Kaasen

Mod note: Moved from a Homework section 1. Homework Statement I want to solve: ∇2E, for E = exp(ikr)/r, where r = √x2+y2+z2 Thus I must solve: d2E/dx2+d2E/dy2+d2E/dy2 The derivatives themselves are simple, but very time-consuming! Can you think of any tricks I can use to simplify the calculation?

What is the name of the physics concept that explains why a tall structure that is fixed at one end (like a scyscraper) will break more easily when a force is applied horizontal to it (e.g by a strong wind) than a shorter structure (e.g a small house)?