Recent content by matttan

Though I am an high school student, but I do know about special relativity (but not general relativity) eg. length contraction, time dilation etc as I used MIT ocw lecture slides to teach myself, but they didn't mention about "speed of forces". And I was just wondering how things appeared when...

Sorry, I really do not understand the thread above as I am currently a senior high school student. But are they trying to say that the speed of sound is the limit for forces to travel for the block of wood I mention above?

If speed of light is the upper limit of speed in the universe, how about force? (please refer to example for the paradox) For example if there is a block of wood 50 light seconds long floating in free space, say it weights only 1 kg and I apply 1 N causing it to accelerate 1m/s^2. So does the...

Yeah that's what I mean. So the time on Earth measured is 4 years?

Alpha centuri...4 light year relative to who? Hi, Here it goes. Suppose it takes 4 light years to get to alpha centuri. So if I could travel at 99.99999% the speed of light and the people on Earth remains stationary(as in moving very slowly which is << C). So does my clock shows 4 years...

Thanks for all the reply (: Refer: http://mathworld.wolfram.com/Between.html " All points on a line segment excluding the endpoints lie between the endpoints. " So I guess Between 0 and 2Pi means 0 < x < 2Pi? Because the author is confusing me as for the 1st example, the question states...

Hi, I was doing trigonometry and I came across this problem when they said "between". If they said between 0 to 2pie radians, do they include 0 and 2pie or it is 0 < x < 2pie ? Thanks

erm its because I want to do a double major in theoretical physics and mathematics and the university offers either pure mathematics or applied mathematics. So I am confuse which one to take to compliment theoretical physics. Any suggestions as to which mathematics(pure/applied) is more related...

Do Theoretical physicist uses pure maths or applied maths? Thanks

So that is to say if we are in a vacuum(no air), we will accelerated forever as the friction between the tires and the car is constant and no fluid resistance/drag(vacuum).

hi, I would like to know does friction increases as speed increase.(all factors like surface of the road are held the same). For example, if I am on the road at 0m/s then I applied a constant power to my car via the fuel pedal, base on Newton's 3 laws, I would be accelerating, but I guess the...

Yup I think I know f(g(x)) but are u using this to explain d/dx e^-x = e^-x and before that, is d/dx e^-x = e^-x correct?

I do not know, please enlight me.

I will use other notation:smile: If f(x)=e^-x then do f'(x)=e^-x ?

1st qs: I know that d/dx of e^x is e^x, but how bout negative power?(see example below) Is d/dx e^-x = e^-x ? and 2nd qs: If the power if not x but 3x + 4, y=e^(3x+4) then is d/dx e^(3x+4) = e^(3x+4) ? :confused: