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.
These questions will have to come with all kinds of qualifiers. First of all, every state has weight limits for trucks. Twenty-six states maintain minimum federal gross vehicle weights (weight of truck and load) of 80,000 pounds, while 19 states permit trucks of 105,000 pounds or more. Michigan tops the list with 115,000 pounds.