Recent content by Count Duckula

Homework Statement Tangent to C at point P(2,7) has an equation of y=3x+1. Point Q also lies on C and is perpendicular to the tangent, show that the X-coordinate is [1/3(2+√6)] Homework Equations curve C has equation y= x3-2x2-x+9 dy/dx = 3x2-4x-1 The Attempt at a Solution gradient of...

Ugh. ok, so its, 3√5 * √5

Here is the question: http://i259.photobucket.com/albums/hh299/the-real-guitar-hero/Capture_zpsf2b9cd28.png part A = 3√5 b=y=2X+1 c=(0,1) D is where I am confused. Area of triangle = (base x height)/2 from working out, line 2 cuts the x-axis at -1/2. line 1 cuts the x at 7. the height is 3...

Hmm, but what is the need for comparison at all, if 1.67x10^-27 is agreed to be 1U of relative mass, and you know the atomic mass of an atom, that is the mass, right? Sorry, I think I'm confusing myself by over thinking this! :( Maybe C is used simply because it's easier to weigh as its a...

Hi everyone, This is really annoying me, so, I am aware of the story why oxygen was replaced with carbon-12, (because chemists were using natural occurring oxygen which was a mix of oxygen-16,17,18 and therefor was an avg?, but physicists wanted pure, isolated oxygen-16 so there was two...

speed and memory and problem solving. For example a maths equation, I would love to be able to solve math equations very fast. although like 'zoobyshoe' stress most likely does play a role in intelligence and I am stressed all time, and I worry about everything, in fact I am going to doctors...

Hi everyone, Today I have been wondering if it is possible to improve your IQ and if you could how much could you improve it by. I was sceptical about to googleing such a topic as there is most likely company looking for paid subscriptions (and unreliable info). If it were possible, how do...

Homework Statement Hi all I have this simple graph that is about how the length of a wire affects it's resistance. I usually get homework questions asking me, what conclusion can you make from you investigation (using the graph) and explain why you made this conclusion. The only problem is...

I don't know, all the information for the question I have is what I have given... ... oh... under the question there's another line that says, 'after the collision both balls move to the right but the velocity of ball A is now 1m/s ... I should be able to figure out these questions now, I...

ok so my physics textbooks crap, it explains something in a tiny paragraph without any examples (I'm getting new ones). I have this question I'm stuck on. There is 2 balls that both have the mass of 1.5kg, one is not moving and one is moving at 4m/s - so ball A is about to collide with ball B...