Recent content by Nerd

Thank you. That is quite obvious, isn't it.

Hi. Please tell me where this reasoning is wrong, because I know it is but I can't see how. f(x) = sinx f ' (x) = cosx f(60) = sin 60 f ' (60) = cos 60 but g(x) = sin 2x g'(x) = 2 cos 2x set x = 30 then: g(30) = sin 60 g'(x) = 2 cos 60 but f(60) = g(30) so f ' (60)...

Thank you all for your input. I realize that diffraction reduces greatly when the slit is much larger than the wavelength. I am still wondering, however, if diffraction would occur if the source is closer to the slit than the length of a wave. I did a experiment with a piece of rope, to try...

The downward force on falling objects is always constant (if you put air resistance aside). The downward force would always be the mass of the object times the gravitational acceleration of the Earth (roughly 9.8 m/s2). The curve with which the bike travels doesn't make any difference.

I know this may sound like a homework question but it is not. I am having an argument with my science teacher and I was hoping you guys could help me prove her wrong. The argument goes as follows: My teacher says diffraction cannot take place if the opening is bigger than the wavelength of...

Magnetic and electric fields are waves.

The whole prinicple of higher orbit - slower speed has to do with the law of conservation of angular momentum. The momentum has to stay constant (p= mvr), with r the distance between the satelite and the earth, which means if r increases v has to decrease and visa versa.

Hi, I am not 100% sure about this but I think you would need to know a lot more about the magnets than just the length to determine the force of attraction. For your second question I am pretty sure that magnetic attraction can't be canceled out no matter what you put in between the magnets...

Sorry, I meant refraction. It's a translation error on my part.

As I read your question and the reply I thought of something very interesting. If the hot gas is released into space, we would naturally think that the gas should cool down. However, heat is proportional to the kinetic energy of the gas molecules and since there is no surrounding particles to...

Thank you. I have another question though. Diffusion occurs when a wave enters a optical denser material or visa versa, for instance, a light wave moving from air into water will change direction. Does the light wave's direction change at the first water molecule that reemits it or does it...

If the man inside the satellite experiences zero gravity than that means all forces acting on him cancel each other out, in other words it is as good as if they didn't exist. Thus you will use normal equations but gravity will be equal to zero.

So this would mean that for 2 magnets with the same volume, the one with the biggest surface-area would have the strongest field. Is that correct?

Then we can assume that air (oxygen, nitrogen ect.) have practically no absorption, since the whole electro-magnetic spectrum can travel through air. This means that it would be impossible to cut solid oxygen with any type of laser, right? Do you know if a mirror can reflect X-rays?

What you say makes sense, however if lasers did cut metal by heating it to melting point, I would think that this happens by exciting the electrons in the metal, which would lead to more kinetic energy and thus increase heat. If this is true than why do mirrors reflect lasers beams, afterall the...