What is the mass of a squirrel if it has 40 J of potential energy in sitting on a house 2.5 m

Which of the following correctly describes the early view of catastrophism?

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

What is a subatomic particle with a negative charge and very little mass?