At tequals0, a train approaching a station begins decelerating from a speed of 140 mi/hr according to the acceleration function a(t)equalsnegative 1120 left parenthesis 1 plus 4 t right parenthesis superscript negative 3 mi/hrsquared, where tgreater than or equals0. how far does the train travel between tequals0 and tequals0.1? between tequals0.1 and tequals0.3?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c