A new roller coaster contains a loop-the-loop in which the car and rider are completely upside down. If the radius of the loop is 15.2 m, with what minimum speed must the car traverse the loop so that the rider does not fall out while upside down at the top? Assume the rider is not strapped to the car.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

their crystal patterns have been disrupted by stress

e/c, where e is its total energy