Recent content by Leo32

Hi Formulajoe, Did you consider the questions of Vincenchan ? If a vector should be parallel to the y axis, what requirements can you put on the x, y, z coördinates. I'm sure you can work out the algebra to calculate the solutions, but I've got the impression you're a bit in the vague as to...

I was just wondering: How many of you first made a small sketch indicating all forces on the vehicle, before starting to calculate ? Greetz, Leo

Hi, I'm trying very hard to study Quantum Mechanics on my own using Shankar's "Principals of Quantum Mechanics". Although the number of exercises is quite small, no answers are given. Do any of you know of a site where I might verify my results ? Greetz, Leo

gravity is curvature According to the GRT, curvature is gravity and vice versa. Gravitational waves should not be imagined like electro magnetic waves, but rather as curvature ripples which move across the 4 dimensional space. As such, gravity does not escape from a black hole. It is...

My favourite trick (when I have the time for it) is to waste that precious thing tele-marketeers have: time. I lure them into explaining all details about whatever they sell, going from obvious to less and less obvious. Going from normal amount of people that can sit on the couch to the...

Giving the average a bump upwards, I'm 34.

To be 100% exact, "No" should read: "no when using front coated mirrors". In your every day life, mirrors have a reflective layer at the back of a piece of glass. Just to make sure the cleaning lady doesn't scratch it off. Using such a mirror would change the focal length, as the light...

Indeed, the irony was understood, but being so, it was pointing in the right direction with the addition of a little humor. Books it is then, and on line material :) I always wonder why people are writing popular science magazines for the lay mans assuming that this very lay man has no...

Hi all, For some time now, I've been looking for a good magazine / journal which handles physics. Coffee table should be interpreted like in Integrals definition: As of today, I've found some popular ones, like "new scientist", "scientific american". The issue I have with them that you...

If you are "stopping", and the rest of the universe is accelerating, that would be the same as you accelerating in the opposite direction. Take note that the theory of special relativity (and I'm pretty sure general as well) does not include any statements on the direction of speed or...

Maybe start with how wide the gap between the blades is, expressed in radians...

The hydrogen atom as such is not in a state of any kind, the electron swirling around the proton does. In order to start thinking about the solution, ask yourself what happens to this energy state when a photon is radiated. Is it higher or lower ? Regards, Leo

Might not be a 100% physics problem, but it's a nice one to calculate: Say you have 2 cups, one filled with coffee, one filled with exactly the same amount of milk. Take a spoonfull of coffee and dump it in the milk, stirr well. Take a spoonfull of this milk with coffee mixture and put it...

1. Calculate how much potential energy that mass of water turns into kinetic energy when it falls down per second. This kinetic energy is the power that you could ideally take out of it. This should get you started. Feel free to post your solution or assumptions here for a reality check...

By the way, if you approach this problem in a vectorial way, the solution is much more elegant than using derivatives and rates. Just assume either the 30m/s velocity vector to be either along the hypothenuse or the x-axis, depending on your interpretation of the question (make sure to...