A student is doing an experiment in science class. the instructions are to make a heterogeneous mixture and then separate all the components of the mixture back out again. She decides to use sand, gravel, salt, and water. Describe methods that she could use to separate the sand, the gravel, the salt, and the water apart from each other without losing any of those components

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

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.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?