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.
Some teens try these substances only a few times and stop. Others can't control their urges or cravings for them. This is substance abuse. Teens may try a number of substances, including cigarettes, alcohol, household chemicals (inhalants), prescription and over-the-counter medicines, and illegal drugs.Teens use alcohol more than any other substance.ven occasional alcohol use by a teen increases the risk for future alcohol and drug problems. Even casual use of certain drugs can cause severe health problems, such as an overdose or brain damage.