moonacstar

My desktop computer, a Dell dimension 3000 with a windows XP operating system freezes up once you get to the desktop. The mouse moves but clicking on icons or the start menu does nothing. The keyboard works in that I can click cap lock and it will cap lock. But I can't bring up the start menu or anything like that from the keyboard. I can bring up the task manager or the shut down screen option with the Ctrl + Alt + delete, but clicking any option there is useless and does nothing.

I figured this had to do with the updated Avast anti-virus, so I tried to boot from my Windows OS CD to set my computer back to the factory settings, but I can't boot from the CD. I tried hitting F12 and telling it to boot form the CD and tried the setting up my computer (F2) to boot from the CD first, but nothing. Each time, it just ignores the prompt and goes to windows screen and then to the log on screen. So, I basically can't even restore the computer back to the factory settings.

So, can anyone tell me what's wrong with my computer and what to do about it myself? Thanks.

This is a partial derivative problem with maximum and minimum values. Any help would be appreciated.

I'm stuck on this one where I am given r = 2cos(θ) and asked to obtain the corresponding equation in rectangular coordinates. For some reason, my answer completely cancels out and I can't figure out why.

Also, I'm stuck on ρcos(φ) = 2 and I am also asked to obtain the corresponding equation in rectangular coordinates.

Could anyone help me with this, thanks?

I think this is a dihydroxylation reaction, but only if KMnO4 and -OH was in cold and diluted (low concentration) conditions. If it were a dihydroxylation reaction, it would form a cis steochemistry product.

But this one is in warm and in high concentrations, so I really am not sure what would form. I think a carboxylic acid would form, but I'm not certain. Could anyone help me with this?

Thanks.

The form of Newton's Law of Universal Gravitation is given as F = (mgR^2)/((x+R)^2) where:

-g is the acceleration due to gravity

-m us the mass of an object projected upwards

-R is the radius of the Earth

-x=x(t) and is the object's distance above the surface of the Earth at time, t.

I'm also given Newton's Second Law which is, F =ma = m(dv/dt) = -(mgR^2)/((x+R)^2).

I'm given the question: Suppose a rocket is fired vertically upward with an initial velocity (Vo) and h is the maximum height above the surface reached by the object. Show that:

Vo = sqrt((2gRh)/(R+h)).

The only hint I'm given is that by the chain rule, m(dv/dt) = mv(dv/dx). Could someone help me with this, because I'm not sure where to derive the velocity from (chain rule hint).

Thanks.

This is a question from my economic class at school and I really don't get what a balanced portfolio would consist of.