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.
Among teens, common performance-enhancing drugs and supplements include: 1  Creatine. 2  Creatine is a naturally occurring compound in the body that's also sold as an over-the-counter supplement. 3  It's used to improve performance during high-intensity bursts of activity and increase muscle mass and strength. 4  Anabolic steroids. Anabolic steroids are synthetic versions of the hormone testosterone, used to build muscle and increase strength. 2  Steroid precursors. 3  Steroid precursors, such as androstenedione (andro) and dehydroepiandrosterone (DHEA), are substances that the body converts into anabolic steroids.