I have a non conducting sphere with a charge ρ=A/r per uni vollume A is constant. suppose there is a cavity in the centre and within a particle of charge q. i want to find the E inside the sphere in respect with r.
Homework EquationsThe Attempt at a Solution
for radius equal of the cavity i get...
1.Problem statement
Prove the average external force of a system of particles N starting from rest and ending at rest is zero.Homework Equations
If the system moves periodically prove the av. external force is zero in a period
The Attempt at a Solution
I don't quite understand what i am asked...
At the 0 point using conservation energy i get something like u_a^2+u_g^2=2gsinθl now i know dx/dt=u_a=lsinθdθ/dt . find same way u_G now squaring those. andi plugging them in conservation i get Ldθ/dt=sqrt(2sinθ) this is a differential eq separable. find θ(t) and solve for θ=π/2 but i can't...
Ok I am trying to do what you said i get the same with i did already .what is different? MY potential energy was zero when G was at L distance so if its zero at the same height i sa the final potential energy is the initial i found.
some1 else told me to llok at the relaton between the accaleration o A in x axes withs its component to the direction AG and then the relation between Gs accelaration and that component
ive been trying 2 days now straght . all . I've asked other people no1 will give me a full answer so i can study it and understant it. because that the policy .. i give up
nvm i give up.. its 3 day straight I am just doing this thing... and no1 can give me a full answer since i can't derive it..gn