the diagram shows two forces acting on an object the forces have magnitudes f1=3.9N and F2=1.3 what third force will cause the object to be in equilibrium

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion