Recent content by azizlwl

((x+1)^2 -1)/(x+1)^2 dx 1-1/(x+1)^2 dx Let u=x+1 1-1/u^2 du u+1/u +c (u^2+1)/u +c Not as answer given in the book.

Thanks, I rest my case.

Its a matter of solving part(iii) To me that's how to solve that particular question. Its all there as clue to the answer. 1. It is place 45° below - x axis, will it hard for student if placed elsewhere. 2. It passes the origin, will it passes origin if put somewhere else. So we can deduce that...

If we take a line 45° line above x-axis, and consider 2 masses 1kg, the pull at any point is along that line will along that line only 45°, since two perpendicular force along the line pull by the 2 masses will be cancelled. 2kg mass is on the 45° line.

I think you can find COM of the three masses. Then you can find the energy(KE) to take the particle away from origin to 300m away, using integral here since force not constant Just like throwing an object upward to a point, on earth, and return to the point of launching.

The object is subject to constant force thus constant acceleration. You know the length traveled and both initial and final velocity.

Your workings.

Post them here.

You can apply Newton's law too, F=dp/dt

Coulomb's law, F=kQ1Q2/r^2 Work=Fr Since F is not constant between A and B, we have to calculate based on small distances dr so that F is constant within it. dW=F(r)dr Edit You have to apply Gauss law too for the ring.

Graphical method and sine law.

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elesph.html

Have you learn about Gauss's Law?

There many charges distributed uniformly on the surface of the sphere.

What is q1?