The 100 -kg block A is released from rest . If the masses of the pulleys and the cord are neglected , determine the speed of the 20- kg block B in 2 s.

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Describe the forces both attractive and repulsive that occur as two atoms move closer together.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.