Recent content by lufbra08

Homework Statement A line of uniform charge starts at x=+X0 and extends to positive infinity with uniform linear charge density U. Determine the electric field at the origin. Homework Equations E=kQ/r^2 The Attempt at a Solution dQ=Udr E=kU int(from x0 to infinity)dr/r^2...

Homework Statement 13 equal charges, q, are situated at the corners of a regular tridecagon. What is the net force on a test charge, Q, situated at the centre. Homework Equations F=k(qQ/r^2) r^ (r^=r vector/r) The Attempt at a Solution The net force will be zero due to the...

Can anyone help, I really need this homework done?

I know that, but is it the rate of change of momentum for the whole system, as the moving car slows down, whereas the stationary car speeds up after the collision. So how would I find the change in momentum?

Hi all, struggling with a question. A vehicle of mass 600kg, moving at a speed of 30m/s, collides with a stationary vehicle of mass 900kg. The two vehicles lock together on impact. Calculate a) The speed of the vehicles immediately after impact b) the force of the impact, if the...