You may have noticed runaway truck lanes while driving in the mountains. these gravel-filled lanes are designed to stop trucks that have lost their brakes on mountain grades. typically, such a lane is horizontal (if possible) and about 34.5 m34.5 m long. think of the ground as exerting a frictional drag force on the truck. a truck enters a typical runaway lane with a speed of 54.0 mph54.0 mph ( 24.1 m/s24.1 m/s ). use the work-energy theorem to find the minimum coefficient of kinetic friction between the truck and the lane to be able to stop the truck.

If element x has 99 protons how many electrons does it have

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field.it is in the opposite direction from that of the original external field.it has a direction determined entirely by the charge on its surface.it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0

Which of these metals are magnetic?