Who proposed relationship between atmospheric carbon dioxide concentration and temperature? Arrhenius suggested a doubling of the CO2 concentration would lead to a 5oC temperature rise. He and Thomas Chamberlin calculated that human activities could warm the earth by adding carbon dioxide to the atmosphere. What is the relationship between depth and CO2 level? At typical […]
Is the Bohr model useful?
Is the Bohr model useful? Of these two models, the Bohr model is simpler and relatively easy to understand. A model is useful because it helps you understand what’s observed in nature. It’s not unusual to have more than one model represent and help people understand a particular topic. What was wrong with Schrodinger’s model? […]
Is clockwise work positive or negative?
Is clockwise work positive or negative? In cyclic process, work done is equal to the area of closed curve. It is positive if the cycle is clockwise and it is negative if the cycle is anticlockwise. Where did the term clockwise come from? An old Scottish word that is still used is “widdershins”, meaning “against […]
What solution did not dissolve?
What solution did not dissolve? A saturated solution at a given temperature is one that will not dissolve any more solute when the solution is in contact with solid solute. The solubility of a substance at a given temperature is the amount of it required to produce a saturated solution in a given amount of […]
How do deep sea creatures get oxygen?
How do deep sea creatures get oxygen? In general, fishes breathe by absorbing dissolved oxygen through their gills; however, in the bathypelagic (or midnight) zone of the ocean, there is zero light, high pressure, low temperature, low nutrients and low dissolved oxygen content. In order to preserve energy, many fishes in this zone have a […]
How can we maintain our internal environment?
How can we maintain our internal environment? Homeostasis is the maintenance of a stable internal environment. Homeostasis is a term coined to describe the physical and chemical parameters that an organism must maintain to allow proper functioning of its component cells, tissues, organs, and organ systems. What are three examples of stimulus and response? Examples […]
What is the difference between global positioning system and geographic information system?
What is the difference between global positioning system and geographic information system? GPS stands for Global Positioning System. GPS uses satellites that orbit Earth to send information to GPS receivers that are on the ground. GIS is a software program that helps people use the information that is collected from the GPS satellites. What are […]
What is the hardest AP class?
What is the hardest AP class? United States History, Biology, English Literature, Calculus BC, Physics C, and Chemistry are often named as the hardest AP classes and tests. These classes have large curriculums, tough tests, and conceptually difficult material. What percentage is a 5 on AP test? The percentages needed to get a 5 are […]
What is not a crosscutting concept?
What is not a crosscutting concept? In brief, a concept is crosscutting if it communicates a scientific way of thinking about a subject, and it applies to many different disciplines of science and engineering. A concept is not crosscutting if it does not communicate a scientific way of thinking or if it only applies to […]
Why is walking possible?
Why is walking possible? Newton’s third law states that every action has an equal and opposite reaction. This is relevant to walking because when you put your foot on the ground, you are applying a force to it. In doing this, the ground also actually applies an equal force onto your foot, in the opposite […]