What two factors affect the gravitational force between two objects

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

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

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?