Recent content by iratern

Vela , wow! I could never say it ins such a clear way (but then again I'm 18 and still have a lot to learn!)

then you can use that to get the heat water needs to give for the temperature drop. Then you can use algebra to solve for the change in the ices temperture/ melting.

Then wouldn't you need to know that final=initial speed? Since if the ball's speed changes at all from it's initial vertical position it will have Gained energy.

Do you know the concept of density? as in mass per volume? you can use that to calculate your waters mass. As for the final temperature of the water you should calculate how much heat it needs to give up. Then see how much heat the ice can give up...

Because energy is not conserved. While you raise the ball you exert force on it, which means you are giving the system energy. Unless you calculate that energy, it won't work. The Conservation of energy is NOT just the potential energies of the ball and the spring! There is also the speed...

What about the pressure caused by gas phase of the liquid in the container? (Also, unless in a vacuum there is going to be atmospheric pressure caused by the gases trapped in the container.) Anyways liquid-gas transition (i.e evaporating) is not the same as boiling. Any liquid can...

Well IMO, entropy is just a abstraction of what's actually going on. I mean entropy is a macro property based on a substances micro-properties. Now if you have a gas in a container and you only have 2 gas molecules then you wouldn't need entropy. You can do all the calculations you want just...

I am just a freshmen (in Canada! also into math/physics) but I if you're asking about reputation, I've heard a lot of awesome things about Cambridge part 3, I think there was some talk about it in the who wants to be a mathematician thread.

absolute value is defined as if x>=0 then |x|= x, if x<0 then |x|= (-x) which basically means that absolute value is the numbers distance from the origin of the number line a.k.a any number within the absolute value comes out as a positive number (except 0 which, obviously, is still 0)

sorry I haven't worked out the problem, I would but it's late here so I am on the sleepy side... But it's probably in the algebra or in the simple math keep on it...

you can use the energy equation to find the final velocity: mgh = 0.5mv^2, write down all the equations you can, then try to find a way to isolate sin (remember sin^2+cos^2 = 1)

you know every other variable except for the sinus and the co-sinus, so you can solve for (by plugging the components into the relevant equations) them and hopefully get the angle by using arcsin(value of sinus).

Ok, first thing you are trying to find the 2 angles. So you can't know them. But you can solve the question using algebraic equations. (Sorry I am new to this so I may not be really clear) But you do know that one component of the velocity will be (the horizontal one) will be V (velocity)...

Well fist of all what are your thoughts on the answer? What is your reasoning? You should show us your attempts at solving the question.

No, the question doesn't want a numerical value. A tip: The answer is in terms of L and Q. The simplest form would include them and a rational number.