Not sure if this approach is correct at all, but I'll just have a go at it. 

What exactly is pie in this context? 


Lost count of how many lucid dreams I've had

Not sure if this approach is correct at all, but I'll just have a go at it. 

Last edited by ThePieMan; 02012012 at 09:23 PM.
That's looking pretty good, there's just a couple of points to be made. 

Thanks, that does clear up some issues I've been having with inclined plane questions. 

Not really by rote, but yes, definitely practice makes perfect. But you seem to be getting there, it's essentially just vectors. Once you get used to the idea that forces, accelerations, velocities and displacements are essentially arrows in space and behave like you would expect arrows to, the Mechanics modules should be a bit of a gift. In any case they only ever give you the same kinds of question over and over, so any stuff that initially seems tricky like separating a weight force into parallel and perpendicular components will eventually come naturally. I never learned the actual specifics of how to do the stuff, I would always just redraw the diagram with the different angles and arrows and go from there. 

Tells us what the answer was when you find out! 

Use equation of motion now that you know acceleration? So s=ut+1/2at^2 = V*2Vcos(pi/4)/g + 1/2*(5root2/2) + (2Vcos(pi/4))^2. I think you'll end up with an expression for distance in terms of V. 

Right, lets leave the mechanics aside now . 

Last edited by ThePieMan; 02022012 at 01:22 PM.
No, like I said, you need to take into account the work done by friction... 

(i) Completed. 

That's good work so far... with ii) if you split 51/2 into an integer and a fraction like you did for the argument, you should see how it's equal to the other thing. With iii) you just need to keep going, solve (z1)/z = a for z, where a is a fifth root of unity. 

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