Aneutron star has a radius of 1.3 x 10 m, and a surface temperature of 6 x 10 к. (a) what is the luminosity (in solar units) of the neutron star? (b) a planet orbits the neutron star at a distance of 2 x 10" m, and with a velocity of 40 km/s. how massive is the neutron star in solar masses? (c) suppose this neutron star were to somehow turn suddenly into a black hole. what would its schwarzschild radius be? how would this change the orbit of the planet?

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.