Does anyone know how to do this

Energy is the ability to do work which measures what

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

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two