When a point mass m with charge q is constrained to move along a frictionless line (up and down) with a charge Q at the botton with the same sign as q. Show that the particle is in equilibrium at position y0 = p kqQ=(mg).

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge? a. r^-1 b. r c. r^-2 d. r^2

Debris produced by mining is called

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?