Recent content by Sennap

How much force did the ship exert on the pilot before the ship took off? When the ship takes off from the ground, does the ship exert more force on the pilot or less?

Homework Statement Let \phi (k) be the Fourier transform of the function \psi (x). Determine the Fourier transform of e^{iax} \psi (x) and discuss the physical interpretation of this result.Homework Equations (1) \tilde{f} (k) = \frac{1}{\sqrt{2 \pi}} \int{f (x) e^{-ikx} dx} (2) \psi...

Yes, sorry about that. It's fixed now. - Sennap

Homework Statement Let f: R->R be a function which satisfies the condition: f(x+y) = f(x) \cdot f(y) \forall x,y \in R a) Show that if f is everywhere differential it satisfies the equation: f'(x) = f'(0) \cdot f(x) Conclude that either f is the zero function or there exists a number c so...

Thank you for a quick reply! dr/dt = 1/(2*pi*r) dA/dt and dA/dt = -2*pi so dr/dt = -1/r And like I showed before r = sqrt(75) so the final answer is indeed: dr/dt = -1/sqrt(75)**SOLVED** Thank you again. I understand your solution a lot better than my teacher's.

Homework Statement (Translated, sorry my English) Find how fast does the radius of a circle get smaller when its area is 75*pi cm^2 and it (the area) gets smaller at a rate of 2*pi cm^2/s? Homework Equations Not really any given equations, but I used these: A = r^2 * pi s = v*t + s0 (If v is a...