A very thin insulating annulus (a disk with a hole) has an outer radius R, and an inner radius of R/2. There is a charge Quniformly distributed over the surface of the annulus. The z-axis of the annulus would be perpendicular to the surface of this paper, located at the center of the disk. Consider the center of the disk to be the origin. A.Find the potential as a function of distance zfrom the annulus, along the axis.

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience.b. report the adverse drug experience to the irb only if there are several other occurrences.c. report the adverse drug experience as part of the continuing review report.d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

Decreased sensitivity to an unchanging stimulus is known as