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 do cheetahs have very little genetic variation?
Why do cheetahs have very little genetic variation? Even though the number of cheetahs grew to as many as 100,000 during the 19th century, their genetic variability remained low due to the extreme bottleneck event that took place thousands of years previously. What are the two types of variation? There are two forms of variation: […]
What is the primary rule of soccer?
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 […]
Which sentence best describes mass movement?
Which sentence best describes mass movement? The downhill flow of soil and rock resulting from gravity best describes mass movement. The downhill flow of soil and rock resulting from gravity best describes mass movement. Which type of mass movement occurs when a fragment of rock breaks off and drops almost vertically to the ground below […]
How quickly does Peat form?
How quickly does Peat form? Peat is formed by decomposition and accumulation process of plant materials that grow on the land which is influenced by dry and wet season period. Peat formation occurs in a long period with the formation rate of about 1 mm per year (Charman, 2002), which means 1 m deep peat […]
What type of system is a hydraulic system?
What type of system is a hydraulic system? A hydraulic system is a drive technology where a fluid is used to move the energy from e.g. an electric motor to an actuator, such as a hydraulic cylinder. The fluid is theoretically uncompressible and the fluid path can be flexible in the same way as an […]