How did the number of electric trains change from 1900 to 1960? Electric trains changed from _ in the 1900s to _ in the 1960s.

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

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