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 also was the most commonly used drug among 16 or 17 year olds (12.7 percent); it was followed by prescription-type drugs used nonmedically (4.0 percent), hallucinogens (1.6 percent), cocaine (0.7 percent), and inhalants (0.7 percent).rug Teenâs are Most Likely to use the First Time Trying or Using a Drug in 2008: In 2008, of the 2.9 million persons aged 12 or older who used illicit drugs for the first time, within the past 12 months, a majority reported that their first drug was marijuana (56.6 percent).