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.
As in previous years, cannabis was the most commonly used drug, with 6.5% of adults aged 16 to 59 having used it in the last year (around 2.1 million people) Among younger adults aged 16 to 24, cannabis was also the most commonly used drug, with 15.8% having used it in the last year (around 975,000 young adults).