Recent content by Awesomesauce

Homework Statement A particle X with rest mass mx is traveling with speed vx = 0.8c along the x-axis in the lab frame. (a) Write down the four-vector momentum of the particle in the lab frame in terms of vx and mx. The particle decays to two particles, A and B, each with mass mx/4...

Wow. That was the best explanation I have ever read! Thank you so much for your time, that makes complete sense :))

Homework Statement Not a homework problem but: I am revising rotating frames of reference right now and I know that: a_{inertial}=(\frac{dv}{dt}_{inertial})_{rot}+(w x v_{inertial}) But I cannot seem to understand what (\frac{dv}{dt}_{inertial})_{rot} means; more so the 'rotational' bit...

I asked my parents not to buy me anything this Christmas. But, I got some books with the money I got from a few relatives :) Got Introduction to mechanics Kleppner, Feynman's Tuva or Bust, and Don't you have time to think?, Space by DK, and Carl Sagans Cosmos DVDs! :D A bit late now but, Merry...

I prefer studying to music, or sometimes (but less frequently), a constant noise such as a fan. I only listen to classical or instrumental pieces though, as with lyrical pieces I can't help but listen and interpret what the person is saying messing up the 'talking to myself through a problem'...

Well, I can't contribute much to this thread topic as I am in the UK, but I am Asian myself (Chinese). Education is hugely emphasised in our culture as one reason; our parents and grandparents etc lived with little wealth and had to work very hard for little means (such as a farmer or food...

"The best of the golds at the bottom of the barrels of crap" - Randy Pausch The 'rest of physics' does not come optional (un)fortunately. You can't just jump into the deep end without teaching yourself to tread water.

Ah sorry, didn't make my workings clear. :p(ii) Find \int^{X}_{0} xe^{-x^{2}} dx for X= 1, 2, 3 and 4 I will just do X=1, so I understand how to do the others on my own later. \frac{1}{2} [1 - e^{(-1)^{2}} ] and get -0.859. The answer should be 0.3161, and to get this I need to remove the...

Hurray I got it! Thank you x1000. But why do I not substitute the minus aswell, so u= -x^2? rather than just u=x^2 Edit: Checked over it, seems like it only works if I substitute u=-x^2 not u=x^2, ...or not? Confusion! :( Do you know why my second part is wrong?

Homework Statement (i) find \int^{X}_{0} xe^{-x^{2}} dx in terms of X. (ii) Find \int^{X}_{0} xe^{-x^{2}} dx for X= 1, 2, 3 and 4. Homework Equations - The Attempt at a Solution (i) \int^{X}_{0} xe^{-x^{2}}dx -x^{2} = X dX/dx=-2x hence -1/2 dX = xdx so, -\frac{1}{2}...

Someone who is described as playing by ear does not necessarily mean they cannot read music. Playing by ear simply means someone who listens to a piece (however many times), and can recreate the melody without any sheet music. There are many people who can play both by ear and read from sheets...

I agree with the above. Kindle DX is the closest you will find. Any decent Ebook won't have colour. The ones with colour, either have a false e reader screen (Uses LED, what is the point in an ereader than?), or are extremely slow like the recent asian produced one. In regards to the kindle dx...

Damn! Thanks guys. I feel like such an idiot for a careless mistake, costing me 6 marks!

Homework Statement Sandy is throwing a stone at a plum tree. The stone is thrown from a point O at a speed of 35 ms^-1 at an angle \alpha to the horizontal, where cos \alpha = 0.96. You are given that, t seconds after being thrown, the stone is (9.8t - 4.9t^2)m higher than O. When...

6 AS or A2 is a definite overkill. I went to a oxbridge talk a couple of weeks ago, and the tutors said, if the entry requirements don't state it, they don't want it. Simples. The average applicant has around 7 A* at gcses and about 89-92% Average alevel per unit. Man, I thought I was...