Posted on07 July 2010.
Tremont Electric founder Aaron LeMieux talks about his kinetic energy techonology. Tremont Electric is an alternative energy company that is bringing kinetic energy generation to the forefront of the renewable energy industry. The patented nPower® technology has many applications including personal energy generation and wave energy.
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Yes, the choice is completely arbitrary; you can just as easily define the zero datum to be the level of the object at some arbitrary height above the Earth's surface without impacting the calculations. The final answer will obviously look different, but the energy change will be the same.
The zero datum is defined more out of convenience than anything else; it makes sense to us to say an object on the Earth's surface, not being able to fall, has zero potential energy, so we typically define the zero datum to be the Earth's surface.
no more green jobs, that was actually a lie….with obama it is all black jobs, since all he cares about is black people, like fox news says….
Well scale switching basically means that the measure of something, for example distance or space, is changing from one scale to another, for example 1 m to 1 km.
This would relate to gravitational potential energy only in terms of how much energy is changing when changing the scale of distance. Here the relationship is:
PE is proportional to 1/r
Use the law of conservation of energy, i.e.,
(PE + KE)1 = (PE + KE)2
where
PE = potential energy
KE = kinetic energy
and the subscripts 1 and 2 refer to the positions of the block at the top of the hill and position of block 0.750 m from the base of the hill.
Thus being said,
mg(H1) + (1/2)(m)(V1)^2 = mg(H2) + (KE)2
where
m = mass of the block = 1.5 kg (given)
g = acceleration due to gravity = 9.8 m/sec^2 (constant)
H1 = 3.96 m (given)
V1 = 1.71 m/sec (given)
H2 = 0.750 m (given)
Substituting appropriate values,
1.5(9.8)(3.96) + (1/2)(1.5)(1.71)^2 = 1.5(9.8)(0.75) + (KE)2
Solving for (KE)2,
(KE)2 = 49.38 joules
Hope this helps.
Lets push that so we can lose more jobs like in spain.On April 14, Fox News Supreme Court reporter Shannon Bream cast doubt on President Obama's proposal to fund green energy by touting a Spanish study showing that "for every green job created [in Spain], 2.2 jobs are lost." Fox News host David Asman stated that the study is evidence that "green jobs could actually kill other jobs." However, Bream, who appeared on Fox News' America's Newsroom, Your World, and Special Report to report on the study, identified the study's research director, Gabriel Calzada Álvarez, only as "an economics professor from Spain." She did not note that Calzada is reportedly a founding member of the Prague Network, which, according to Radio Prague, is "an international grouping of institutions aimed at countering panic connected with global warming," or that Calzada is reportedly a fellow at the Centre for the New Europe, an organization that has reportedly received funding from ExxonMobil. Moreover, during her reports on America's Newsroom and Your World, Bream did not note any criticism of the study.
According to the Calzada study:
2. Optimistically treating European Commission partially funded data1, we find that for every renewable energy job that the State manages to finance, Spain's experience cited by President Obama as a model reveals with high confidence, by two different methods, that the U.S. should expect a loss of at least 2.2 jobs on average, or about 9 jobs lost for every 4 created, to which we have to add those jobs that non-subsidized investments with the same resources would have created.
3. Therefore, while it is not possible to directly translate Spain's experience with exactitude to claim that the U.S. would lose at least 6.6 million to 11 million jobs, as a direct consequence were it to actually create 3 to 5 million "green jobs" as promised (in addition to the jobs lost due to the opportunity cost of private capital employed in renewable energy), the study clearly reveals the tendency that the U.S. should expect such an outcome.
In physics, potential energy is the energy stored in a body or in a system due to its position in a force field or due to its configuration.
Potential energy exists when a force acts upon an object that tends to restore it to a lower energy configuration. This force is often called a restoring force. For example, when a spring is stretched to the left, it exerts a force to the right so as to return to its original, unstretched position. Similarly, when a mass is lifted up, the force of gravity will act so as to bring it back down. The action of stretching the spring or lifting the mass requires energy to perform. The energy that went into lifting up the mass is stored in its position in the gravitational field, while similarly, the energy it took to stretch the spring is stored in the metal. According to the law of conservation of energy, energy cannot be created or destroyed; hence this energy cannot disappear. Instead, it is stored as potential energy. If the spring is released or the mass is dropped, this stored energy will be converted into kinetic energy by the restoring force, which is elasticity in the case of the spring, and gravity in the case of the mass. Think of a roller coaster. When the coaster climbs a hill it has potential energy. At the very top of the hill is its maximum potential energy. When the car speeds down the hill potential energy turns into kinetic. Kinetic energy is greatest at the bottom.
The more formal definition is that potential energy is the energy difference between the energy of an object in a given position and its energy at a reference position.
There are various types of potential energy, each associated with a particular type of force. More specifically, every conservative force gives rise to potential energy. For example, the work of an elastic force is called elastic potential energy; work of the gravitational force is called gravitational potential energy; work of the Coulomb force is called electric potential energy; work of the strong nuclear force or weak nuclear force acting on the baryon charge is called nuclear potential energy; work of intermolecular forces is called intermolecular potential energy. Chemical potential energy, such as the energy stored in fossil fuels, is the work of the Coulomb force during rearrangement of mutual positions of electrons and nuclei in atoms and molecules. Thermal energy usually has two components: the kinetic energy of random motions of particles and the potential energy of their mutual positions.
As a general rule, the work done by a conservative force F will be
W = – ∆U
where ΔU is the change in the potential energy associated with that particular force. Common notations for potential energy are U, V, Ep, and PE.
Gravitational energy is the potential energy associated with gravitational force. If an object falls from one point to another point inside a gravitational field, the force of gravity will do positive work on the object, and the gravitational potential energy will decrease by the same amount.
The gravitational force keeps the planets in orbit around the Sun
A trebuchet uses the gravitational potential energy of the counterweight to throw projectiles over long distances
Consider a book placed on top of a table. When the book is raised from the floor to the table, some external force works against the gravitational force. If the book falls back to the floor, the same work will be done by the gravitational force. Thus, if the book falls off the table, this potential energy goes to accelerate the mass of the book and is converted into kinetic energy. When the book hits the floor this kinetic energy is converted into heat and sound by the impact.
The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in. Thus, a book lying on a table has less gravitational potential energy than the same book on top of a taller cupboard, and less gravitational potential energy than a heavier book lying on the same table. An object at a certain height above the Moon's surface has less gravitational potential energy than at the same height above the Earth's surface because the Moon's gravity is weaker. Note that "height" in the common sense of the term cannot be used for gravitational potential energy calculations when gravity is not assumed to be a constant.
I agree with you. Who gets to decide what is an excess profit? The government?
Just think if we had taken the money and talent that has been expended in Iraq and instead focused those resources on the development of alternative energy sources. We would be several years closer to achieving energy independence.