From a height of 4 m, a hollow sphere with a radius of 12 cm and a mass of 650 g rolls along an inclined trough (45 ° to the horizon). The system is located on Earth. [1] Find the potential [2] and [3] the kinetic energy at t0 just before the start of rolling and at the end of the slope of t1. [4] Find the momentum at the end of the road. [5] How would the momentum at the end of the slope change if the sphere slipped? Assume that the sphere is rolling in a V-shape slope/track (track sides are at right angle) . The image shows cross section of the sphere in the track.

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.