The tape in a videotape cassette has a total length 189 m and can play for 2 h. As the tape
starts to play, the full reel has an outer radius
of 47 mm and an inner radius of 14 mm. At
some point during the play, both reels will
have the same angular speed.
What is this common angular speed?
Answer in units of rad/s.

magnified images possible images can be real = projected onto a screen

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.