In the experiment, we measure the total time for 20 complete revolutions and divide it by 20 to obtain the period of the rotation. why not measure the amount of time for one complete revolution directly and record it as the period of rotation?

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

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

What is the speed of an object at a given moment?