Recent content by bray d

I was thinking of using the ideal gas law: PV=nRT but ITS NOT A GAS. I'm lost

Homework Statement Prove the equation B=3A, where B is the coefficient of volume expansion and A is the coefficient of linear expansion, considering a cube of side 's' and therefore volume V=s^3 that undergoes a small temperature change 'dT' and corresponding length and volume changes 'ds' and...

thanks!

Figured It Out!

[SOLVED] mass of gas required to lift another mass Homework Statement A balloon contains gas of density G and is to lift a mass M, including the balloon but not the gas. Show that the minimum mass of gas required is m=(MG)/(A-G) where A is the atmospheric density. Homework Equations...

[SOLVED] Bernoulli's Equation Prob? Homework Statement EXACT PROBLEM: Water emerges from a faucet of diameter 'd' in steady, near vertical flow with speed 'v'. Show that the diameter of the falling water column is given by D = d[v^2/(v^2+2gh)]^(1/4), were 'h' is the distance below the...

ok, I understand. Yep, I corrected the sign in the delta U equation and took K = 0 at the surface. this gave me the correct answer after some algebraic manipulation. thanks again for the reply, it's greatly appreciated. have a nice night

that's what's confusing me. I initially thought there would be no initial kinetic energy, but then though about how it got to orbit. in order to get into orbit there must be some kind of kinetic energy right? so I figured there would have to be more initial kinetic energy then there was at...

hmmm, welp that link confirms my thought process...right? anyways here's what I've been getting: first I found the change in potential energy: U= -GMm(1/r1-1/r2) = -GMm(1/R-1/(R+h)) = -GMm/R+GMm/(R+h) Then I tried to find the change in kinetic energy: to find v^2 in K=(1/2)mv^2...

[SOLVED] energy for circular orbit This one should be easy for you guys, I've been workin on it for a while and need pointed in the right direction. For starters, here's the question: Neglecting Earth's rotation, show that the energy needed to launch a satellite of mass m into circular orbit...