(a) a runaway train car that has a mass of 14000 kg travels at a speed of 7.5 m/s down a track. compute the time (in seconds) required for a force of 1400 n to bring the car to rest. s (5 attempts remaining) input 1 status (b) a bullet is accelerated (from rest) down the barrel of a gun by hot gases produced in the combustion of gun powder. if the average force exerted on a 0.023 kg bullet to accelerate it is 3700 n, what will be the bullet's speed (in m/s) in a time of 0.002 s

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

As the distance from a magnet increases, what happens to the magnet force?

You are doing a science experiment with a fahrenheit thermometer. your data must be in degrees celsius. if you measure a temperature of 125°f, what is this temperature in degrees celsius