An infinite, straight wire of radius r lies along the z-axis and carries current i in the ˆz-direction. if the current density varies as j ∝ s 2 in cylindrical coordinates, use amp`ere’s law calculate the magnetic field b(s) inside and outside the wire as a function of i, s, and fundamental constants.

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

Could someone . i have tried to solve myself but my calculation is off

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?