Two electrons are initially at rest separated by a distance of 2nm. at time t=0, they start to move apart due to coulombic repulsion. how long does it take for them to separate to a distance of 20nm?

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents