Why is it particularly important to prevent childhood diseases? ОА.
Our society values children more than the elderly.
OB. Childhood diseases are the leading cause of death in most nations.
OC Childhood diseases are the only illnesses that there are vaccines for.
OD. Children are developing, so the disease's impact can be more severe.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

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.

Most short-period comets do not have randomly oriented orbits because