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.
Marijuana use ranks second behind alcohol in regards to the most commonly abused drugs by teenagers. There has been an increase in marijuana use among teenagers due to the increasing societal attitudes towards tolerance and perceptions that marijuana is not a dangerous drug.
All told, 20 different drugs were evaluated, including cocaine, heroin, ecstasy, amphetamines, and LSD. Ranked from most to least dangerous, the ten most dangerous substances were deemed to be: Heroin - popular street names include smack, skag, and junk. Cocaine - often referred to as snow, flake, coke, and blow. Barbiturates - popular slang names include yellow jackets, reds, blues, Amy's, and rainbows.