We are all familiar with x-rays. They are used to detect broken bones and other injuries to our skeletal muscular system. Other waves in the electromagnetic spectrum are utilized in the medical field. One type of wave, considered a mutagen, is used in cancer therapy. What is that electromagnetic wave?

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio