Recent content by Xalkias

Homework Statement If we assume that a human radiates like a black body, calculate the luminosity in watts, then compare it to the daily energy a human gets from eating. (The area of a human A=1.3 m2) The Attempt at a Solution The temperature of a human is 310K so L=AσT4 =...

Ohh Yes there is a lists of all luminosities in the book but I thought they would mention if this lists was needed. Thank you for your time.

I'm sorry I'm new to this forum. Ok so In my mind I have to find f and then solve for C. So for the sun : ∫fdλ= L/4πd^2 (d=1AU) but then L is unknown so I can't calculate F. Temperature is not given so I can't use that either to calculate F. What should I do

<Moderator's note: Moved from a technical forum and thus no template.> So i began studying on my own for my astrophycis class that will start on 2 weeks and i have trouble solving an exercise. So the exercise goes as follows: given that mbol=-2.5log(∫fλdλ)+Cbol and mbol=-26.83 for sun. Show...

What about U=mgh ? As far as I know acording to this equation potential energy seems to be positive but also getting bigger as h growing. What's going on?

Let's say we have a mass M at the ground of the Earth with speed U going upwards so its energy is E= kinetic. The speed is enough to surpass Earth's gravitational field so now it has a speed U2<U and its energy now is E= kinetic+potential. So my question now is: Is this potential energy lost? I...

Are all electrons perfectly identical? How can we be sure that all electons have the exact same mass electric charge etc. considering that we leave in a world that perfect doesn't exist ... I mean how do we know that electon's A mass can't defer at some point in infinity than electon's B mass...