On a spacecraft two engines fire for a time of 399 s. one gives the craft an acceleration in the x direction of an x = 4.63 m/s2, while the other produces an acceleration in the y direction of ay = 8.15 m/s2. at the end of the firing period, the craft has velocity components of vx = 3160 m/s and vy = 4020 m/s. find (a) the magnitude and (b) the direction of the initial velocity. express the direction as an angle with respect to the +x axis.

Aman tries to push a box of mass 4 kg with a force of 5 n but the box remains stationary if the coefficient of static friction is 0.45, what is the value of the maximum force of friction?

Which notation is used to represent an alpha particle? a. b. c. d.

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.