Physics Topics
Household appliances use a varied amount of electricity, depending on their efficiency. Location of an appliance can affect electricity usage. For example, a clothes dryer in an open location like a garage, is likely to be somewhat less efficient than one located in a house. Similarly, a water heater with improper insulation is likely to [...]
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The answer to the question of how many objects on the periodic table of the elements are naturally occurring is actually a bit complicated. Conventional wisdom says that the first 92 elements, from element one, hydrogen, to element 92, uranium, are all naturally occurring, but in fact some of these elements are highly unstable, and [...]
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Total costs for installing a commercial-scale wind turbine will vary significantly depending on the cost of financing, when the turbine purchase agreement was executed, construction contracts, the type of machine, the location of the project, and other factors. Cost components for wind projects include wind resource assessment and site analysis expenses; the price and freight [...]
A cubic yard is a measure of volume (length in feet X width in feet X depth in feet/27=cubic yards) and tons is a measure of weight. The weight of a material depends on its density, therefore, to determine the number of yards in a ton of material, the density of the material must be [...]
The weight of sea water really depends on a number of variables, including the temperature, the amount of salt (salinity) and whatever other foreign items may be present, and the depth, thus the pressure. But to get to the basic answer, seawater, at the surface, on average weighs 1027 kg/m3, or just over 64.1 lbs [...]
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How Many Chemical Elements are There? A chemical element is a type of atom, like hydrogen or oxygen. As of January 2007, 117 elements have been observed, with 94 of these elements occurring naturally on Earth. 23 elements are artificially created, in nuclear reactors or particle accelerator experiments. The first synthetic element to be created [...]
How Much Uranium is in the Solar System ? We don’t know the composition of the asteroids or the objects in the Oort comet cloud or the Kuiper belt in great detail. One theory of solar system formation is that there are more metals in the inner solar system. That would mean most of the uranium is Mars, [...]
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How many molecules of water are in a single drop? The simplest way is to know two things about the object: 1) Its chemical composition. 2) Its mass. As an example, let’s say we have a very tiny drop of water, say 1 microliter, which would have a mass of 0.001 grams. The chemical formula [...]
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How much does planet Earth weigh? It would be more proper to ask, “What is the mass of planet Earth?”1 The quick answer to that is: approximately 6,000,000,000,000 ,000,000,000,000 (6E+24) kilograms. The interesting sub-question is, “How did anyone figure that out?” It’s not like the planet steps onto the scale each morning before it takes [...]
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