Recent content by Garunekk

Hi, I have been solving one problem recently. I need to calculate, how many times faster is the aging under my UV lamp compared to the real sunlight exposure. I am pretty sure it will depend on the distance of the sample from the UV radiation source, it´s intense and exposure time. I would also...

Here is 2am, and I am mad at myself, sorry. I know it will diminish as r increase. I can write is an (r-R), assuming R is the middle of Earth. Do you mean this?

I really appreciate that you help me, but I don't understand you now. I can rewrite ag as ag=H(Mz)/R^2 ...where H is gravity constant and Mz is weight of the earth. I understand why result looks like it looks. Except the "2".I have no idea where I got it from. But I do not know how to get that...

Maybe I am totally already useless today, but I got similar example in my study textbook (its from my university, and in Czech language, but i try to post it) so I tried to solve it in this way, but I am stuck. Hope you will understant that, its just series of the formulas, and the "v" should...

Yes, my bad, initial mass, sorry. The forces acting on it? Gravity force, I guess. ..I am not pretty sure what do you mean by the "net force". And some differential equations.. I got through d/dt=-km0e^(-kt) to m(dv/dt)=-mg+kmu, but, i am lagged now.

Yes, it is. The result should be But I have no idea how to get that. I tried it through the Ciolkowski formula, but ..I just do not know..

Homework Statement Hi, I would like to apologie for my bad english, but I will try to write my problem as good as I can. I have a homework...From one stage rocket with initinial speed [m[/0] Ciolky´s number C are escaping gasses with the speed u. Let´s assume that weight of the rocket is...