Recent content by kanki

What i mean is, I have a set of points, but i need to connect them using bezier curve, and define new control points by something like in this example: http://www.efg2.com/Lab/Graphics/Jean-YvesQueinecBezierCurves.htm Although the website above did show how to get the magnitude of the control...

Thanks for the link. What if I want to generate the control points automatically like the CURVE function in microsoft word?

Hi there, I am now trying to write program to generate smooth curve by using cubic bezier (4 points, 2 endpoints and 2 control points) through a set of points like the 'insert curve' function in Microsoft Word. I am wondering how do the curve compute the magnitude of the control points of...

Suppose a solid disk of radius R is given an angular speed about an axis through its center and then lowered to a horizontal surface and released, the coefficient of friction between disk and surface is u. What is the distance traveled before pure rolling occurs? Conservation of Momentum...

I'm so confused of the Heisenberg's Uncertainties... Here's a question i have to solve, although it looks very easy but my understanding of Heisenberg's Uncertainties is still shallow. Fuzzy a quantum mechanical duck lives in a world which h = 2 PI Js. Fuzzy has a mass of 2.0 kg and...

helo? no one can help me?

What can i get from vector 12i + 11j, what to do next? Sorry I'm too dumb... i need more explanation if possible...

12i + 11j? u mean for A? still dun understand.

I'm sorry, the s should be located north of b, so b is the origin, and a at (0,5). If vel of b is 12i + 16j, then in next unit of time, it'll reach the point (12,16). What can it help me? I still dun understand.

I'm trying to find the new direction of velocity of A

What i have now is the initial relative position of A from B, which is 5j initial velocity of A is 40i + 30j, the direction is changed so that it can overtake B. Velocity of B is 12i + 16j. I can find the speed of A, which is 50. I tried to let the new velocity of A be 50(ai + bj), then...

But, aren't we have to assume that magnitude of OB and OD is not the same? And so AO is not half of AC. So how to prove that OB + OD = AC - 2AO = 0?

I'm stucked here... How to prove that the diagonals of parallelogram bisect each other using vector method? Let's say for ABCD which is parallelogram, AB//DC, AD//BC, O is the point of intersection of the diagonals. Can i straight away apply that...

So it is overall a deactivating substituent, and render the benzene ring unreactive. But why is it Ortho-para directing? Please explain...

I have some questions here about Benzene. So the presence of one substituent in a benzene ring will affect the ease and position of any further substituent group, such like -CH_3,NO_2,Cl. And it's known that the Ortho,para-directing groups or electron donating groups are ring activating...