A dolphin 12 East, turns around to go 16 West, then reverses and swims 4 km East. This dolphin escapade takes 4 hours What the dolpturt's average velochy? 2 km/h 4 km/h 8 km/h 0km/h

Atomic nuclei of almost all elements consist of

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.

Explain what will happen if decomposers were apsent from a forest ecoysystem.