Why do wheels have friction? A wheel or ball on a surface is held there by static sliding friction. In order to start the rolling motion, a force or torque must be applied to the wheel. The force of the static sliding friction prevents the wheel from sliding and thus initiates the rolling motion. Is […]
Why is it easier for humans to walk through air than liquid water?
What is DNA as genetic material?
What is DNA as genetic material? DNA, deoxyribonucleic acid, is the genetic material in your cells. It was passed on to you from your parents and determines your characteristics. Where is genetic material found? The genetic material of a cell or an organism refers to those materials found in the nucleus, mitochondria and cytoplasm, which […]
Can aluminum be magnetized?
Can aluminum be magnetized? In our everyday experience aluminum doesn’t stick to magnets (neither does copper). Most matter will exhibit some magnetic attraction when under high enough magnetic fields. But under normal circumstances aluminum isn’t visibly magnetic. Why is stainless steel jewelry so cheap? Stainless steel not only mimics the look of fine, precious metal, […]
What will the precipitin test tell a forensic scientist?
What will the precipitin test tell a forensic scientist? Precipitin test identifies the presence of proteins that are found only in human blood. On the surface of red blood cells are molecules (proteins) called antigens. Antigens allow a living system to recognize foreign biological substances, such as infectious agents and allergens. What qualifications do you […]
What two states have no karst?
What two states have no karst? Almost all 50 states within the United States (US) have karst areas (exceptions are Delaware and Rhode Island), with the greatest amount of karst sinkhole damage occurring in Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania (in decreasing order of damage). What is the biggest karst in the world? […]
What is the main purpose of conducting an experiment?
What is the main purpose of conducting an experiment? The main purpose for conducting experiments is to prove or disprove the hypotheses, or ideas of the scientists. What is conducting experiment? The Basis of Conducting an Experiment. With an experiment, the researcher is trying to learn something new about the world, an explanation of ‘why’ […]
What is hygroscopic substance give examples?
What is hygroscopic substance give examples? Hygroscopic substances include cellulose fibers (such as cotton and paper), sugar, caramel, honey, glycerol, ethanol, wood, methanol, sulfuric acid, many fertilizer chemicals, many salts (like calcium chloride, bases like sodium hydroxide etc.), and a wide variety of other substances. What is hygroscopic behavior? Hygroscopicity is the capacity of a […]
Is freezing point depression positive or negative?
Is freezing point depression positive or negative? The change in the freezing point is proportional to the amount of solute added. This phenomenon is called freezing point depression. The change in the freezing point is defined as: ∆Tf = Tf,solution − Tf,solvent. ∆Tf is negative because the temperature of the solution is lower than that […]
Why could jelly fish not tell a lie?
Why could jelly fish not tell a lie? Answer. Answer: because they can not talk. What is the meanest animal? HONEY BADGER Is Cyprus rich or poor? What does it mean for a nation to be rich? GDP per capita adjusted for relative purchasing power provides a clue into that….Advertisement. Rank Country GDP-PPP ($) 31 […]