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.
Alcohol-related motor accidents are the second leading cause of teen death in the United States. The most commonly used illegal drug is marijuana. According to the United Nations 2008 World Drug Report, about 3.9% of the worldâs population between the ages of 15 and 64 abuse marijuana.