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 is the most commonly used illicit drug, according to federal statistics. The most prevalent time for people to experiment with it happens to coincide with their childbearing years. Almost half of all Americans ages 18 to 25 have used marijuana at some point in their lives, and about 15% are current users.