The density of the blade is constant throughout its length, and so a 10%-mass. fragment will have a cross-sectional area of 10% of the full blade. In practice, the. area of a 10%-mass fragment will vary depending upon its shape, and upon whether. it consists of the only the outer shell or the internal beams as well.
Alcohol is the most commonly used and abused drug among youth in the United States.1. 1  Excessive drinking is responsible for more than 4,300 deaths among underage youth each year, and cost the U.S. $24 billion in economic costs in 2010.2,3.
MARIJUANA â Illegal Drugs. Marijuana is the most commonly used illegal drug in the United States. Marijuana is addictive. When a user begins to seek out and take the drug compulsively, that person is said to be dependent on the drug or addicted to it. The main active chemical in marijuana is THC.