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.
After cannabis, the most commonly used illegal drugs in the last month were cocaine (0.5%) followed by methadone (0.2%), amphetamines, ecstasy, solvents, poppers and heroin (each 0.1%).The rate of last month use of other opiates was 14%, the rate for sedatives or tranquillisers was 3% and for anti-depressants, 4%.rug type Cannabis use was the most commonly used illegal drug with 25% of the population having ever used the drug. Among other drugs, lifetime prevalence was highest for ecstasy and cocaine (total) (each 7%), followed by magic mushrooms (6%), poppers, amphetamines, LSD (each 5%) and solvents (3%).