Tin mining began early in the Bronze Age, as bronze is a copper-tin alloy.in extraction and use can be dated to the beginnings of the Bronze Age around 3000 BCE, when it was observed that copper objects formed of polymetallic ores with different metal contents had different physical properties.
Quick Answer. Most semi-trailers weigh about 32,000 pounds when they are empty. Because the amount for a payload must be evenly distributed, the amount of cargo a trucker can haul is no more than 34,000 pounds if he is pulling tandem trailers. Continue Reading.
Bigger engines, more gears in the trans, bigger heavier sleepers, bigger fuel tanks, and other things add to the weight. Trucks pulling vans tend to be the heaviest, with flatbed and bulk haulers being more weight conscious. My company truck weighs in at 18,000 for the truck, driver, full fuel, and all my gear. My trailers run right at 10,000, and cargo typically is 48-50,000 for a road weight betwen 76-78k most times.