A wave is traveling through X What can be known about x? It is empty space.
It is any medium
It is a solid
It is a hud

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

How would a small bar magnet be oriented when placed at position x?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?