Which vector has an x-component with a length of 4?

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

In what direction does the medium move relative to the direction of the wave? explain.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?