A boy swings a ball on a string at constant speed in a circle that has a circumference equal to 6 m.
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China Wireless Charger wholesale - Select 2020 high quality Wireless Charger products in best price from certified Chinese Mobile Power manufacturers, Mobile Charger suppliers, wholesalers and...The advantages of this charger are charging current of 3A, simplicity in the making, input voltage 7v - 40v. It can power directly from the 12v or 24v battery. In this example I used a 14.4V battery from a cordless drill. Step 1: Components. Required components. LM2596; Some wires See more: DIY USB charger for your phone - LM2596