hot air balloon weighing 30n is tied to the ground by a string to prevent from floating of the ground. the volume of the balloon is 20m^3 and the density of air is 1.3 kg kgm^-3.find force exerted by the rope on the balloon

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

Idon’t quite understand this problem

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.