Is there a formula for the velocity of an item falling within a sphere of a specific material, say titanium, This is related to a problem I posted yesterday about Titanium Devouring Aliens.
ok so for the column in which the alien falls the velocity is given by v=sqrt(2gh), now for the spherical one our teacher told us to consider the sphere as having negative charge density, how does this differ from doing it like the column.
I believe you use the formula v=sqrt((2GM)/R), where...
well would the height at the top be 0 and the height at the crash be h, since we're not given numbers. If so then the equation would become 0=mgh+1/2mv^2, so then v=sqrt(-2gh) lol that can't be right :blushing:
oh! well by at the bottom i was assuming you were saying the aliens had already landed and died and were just lying there motionless. I know how to work with equations and numbers and all, just have trouble when it comes to concepts and obscure questions about aliens :-/
ok so the equation...
If at the bottom KE=0, then PE(top)=PE(bottom) but isn't the mass and everything else constant throughout. Doesn't this equation just give a ratio of one? If PE=-W, and W=1/2mv^2, wouldn't 1/2mv^2(top)=1/2mv^2(bottom) give a ratio of one. I guess I just really don't understand these concepts :cry:
I don't understand how you got that the question is asking you for the potential energy each alien has at the surface relative to center of larger sphere. Anyways I barely understand the question and the concepts behind it. *sigh* I hate these questions my teacher just makes up.
Titanium-Devouring Aliens-Gravitational Field,Potential Energy
(Titanium-Devouring Aliens) A spaceship of titanium-
devouring little green people has found a perfectly spherical asteroid that
they confirm is made of homogeneous titanium. A narrow shaft was bored
from some point on the...
ok I'm doing Li=Lf, and after substituting L with mvl(cos(h)), and then h with 12mv²sin(2h)/9.8Ml, I get an equation in which both sides are the same so obviously something is missing, and i don't knwo how to incorporate a and t into this.
thank you , your explanation is helpful, but I'm at a loss to what equations and values to actually use. I figured the hair was fixed since it's lying on a table.