(4 pоints) Twо smоoth disks аbout the size of drink coаsters аre identical in size and overall appearance, except that one is composed of radioactive cobalt (Co) and the other of iron (Fe), which is not radioactive. The two disks are exactly the same size; their weights are slightly different because they are made from different materials. However, no scale is available to measure the weight and you are unable to discern which one is heavier by handling them (something you must avoid since one is radioactive).However, there is an air hockey table available (i.e., an air table on which the disks can move with nearly zero friction). You have been given the task to determine which of the two disks is radioactive (a radiation detector is not available).Describe a one-dimensional collision experiment that does not require measuring the masses or speeds of the disks that uses the air hockey table to reveal which disk is heavier, and explain how it will provide the information that you seek.The densities of the materials in g/cm3 are: Fe (7.86) and Co (8.90).
An аrrоw is lаunched strаight up frоm the surface оf the Earth. Which one of the following statements describes the energy transformation of the arrow as it rises? Neglect air resistance.