Please help Wave interference occurs when?

Waves bounce off of each other
Waves pass through each other
A wave bounces off a barrier
A wave passes from one medium to another

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

Which is an example of an exothermic process?