The purpose of any simple machine is to allow a job to be done with less force than would normally be needed. however, when a string of simple machines are added together to accomplish a task, the overall efficiency of the machine decreases. write a brief essay explaining why the efficiency of a complex machine decreases as more simple machines are used. be sure to include a discussion on the conservation of energy in your explanation.

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.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?