What does a wave do that is so important?

1. in terms of fuel economy rank the following hybrid and electric vehicles, and justify application specific to each hybrid technology stop/start | mild hybrid | full hybrid | plug-in hybrid | full electric a. rank based on fuel economy b. justify your application specific for each technology

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

What sort of waves exhibit the doppler effect?