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At which location would an object weight be the greatest? A nail put into tree at height of 2m from ground.This tree grows at rate of 0.5m a year. How high above ground will nail be after 20 years.? If you weigh out 2.105 grams of sand / salt mixture and end up with 1.095 grams of dry sad what is the percent of sand in their original mix? Current of 10 A flows to the opposite directions in the follwing wires. Find the total magnetic field in the "P"? How do Elephant Seals interact towards humans?