Find the distance between P1 (7, 217/180 pi) and P2 (5, -23/36 pi) on the polar plane. ( show work)

A 2600-pound truck is stopped at a red light on a hill with an incline of 25 degrees. ignoring the force of friction, what force is required to keep the truck from rolling down the hill? (show work)

An airplane is taking off headed due north with an air speed of 173 miles per hour at an angle of S47 degrees E. Find a vector that represents the resultant velocity of the plane relative to the point of takeoff. Let i point east, j point north, and k point up. (show work)

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect