Category: Physics

What models are useful in describing the growth of a population? Environmental scientists use two models to describe how populations grow over time: the exponential growth model and the logistic growth model. Carrying capacity: Carrying capacity is the number of individuals that the available resources of an environment can successfully support. What is the difference […]

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How many steps are in the design process? five steps What is the design thinking process? Design thinking is a non-linear, iterative process that teams use to understand users, challenge assumptions, redefine problems and create innovative solutions to prototype and test. Involving five phases—Empathize, Define, Ideate, Prototype and Test—it is most useful to tackle problems […]

How much of Florida was underwater? As glaciers of ice in the north expanded and melted, the Florida peninsula emerged and submerged. When the sea level was lowest, the land area of Florida was much larger than it is now. The sea level was as much as 100 feet lower than at present. Florida s […]

What does 6 fire sirens mean? Few people really know what it means when they hear about a six-alarm fire. Two-alarm fire: 40 firefighters and four members of comand staff; double the trucks. Three-alarm fire: 60 firefighters, six from command staff. Four-alarm fire: 80 plus eight. Why did I just hear a siren? 1. What […]

What are the major types of chemical reactions? Having a thorough understanding of these types of reactions will be useful for predicting the products of an unknown reaction. The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. What is the difference between a chemical equation and a chemical reaction? Chemical […]

What are the basic components of a simple circuit? A circuit is the path that an electric current travels on, and a simple circuit contains three components necessary to have a functioning electric circuit, namely, a source of voltage, a conductive path, and a resistor. What is the definition of a simple circuit? A simple […]

At what distance does gravity end? Near the surface of the Earth (sea level), gravity decreases with height such that linear extrapolation would give zero gravity at a height of one half of the Earth’s radius – (9.8 m·s−2 per 3,200 km.) What is SI unit of weight? The SI unit of mass is the […]

What are the equations of motion in circular path? An object executing uniform circular motion can be described with equations of motion. The position vector of the object is →r(t)=Acosωt^i+Asinωt^j, r → ( t ) = A cos ω t i ^ + A sin ω t j ^ , where A is the magnitude […]

Is absolute dating better than relative? In relative dating, fossils are dated according to the depth at which they were buried. While in the absolute dating, isotopes of carbon are used for dating fossils. The absolute dating is more precise than relative dating because it tells the exact age of the fossils. What is the […]