In order to determine the rotation speed of a turntable platter it is necessary to acquire a stroboscope disc. Some platters have strobe indicators printed on the side or in the center. If your country's AC mains electricity is 60Hz, the stroboscope must be made for that frequency.
Jicama, also known as yam bean, is a round, fleshy taproot vegetable of bean family plants. Its underground starchy root is one of the popular edible tuber-vegetables grown in many parts of Central American, South Asian, Caribbean, and some Andean South American regions.
With a sharp knife, trim a slice off the top and another off the bottom. These create a flat surface, making it a safe and sturdy vegetable to continue cutting. Work the knife around the jicama, cutting off wide swaths, first working from the top, then turning over and doing the other side. Now, the choice is yours. Dice the jicama, cut it into batons for a vegetable tray -- or grate it for coleslaw, say. It grates easily with a box grater, no need for a food processor except maybe for big batches.