a cooling fan running at 900 rpm (revolutions per minute) is turned off and makes 1,500 revolutions before stopping. what is the magnitude of the average angular acceleration of the fan as it stops?

it becomes positively charged by charging it

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.