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Mechanical work chemical energy-produced

There are many examples of nonequilibrium states. A classic example of a NESS is an electrical circuit made out of a battery and a resistance. The current flows through the resistance and the chemical energy stored in the battery is dissipated to the environment in the form of heat the average dissipated power, Pdiss = VI, is identical to the power supplied by the battery. Another example is a sheared fluid between two plates or coverslips and one of them is moved relative to the other at a constant velocity v. To sustain such a state, a mechanical power that is equal toVoc r v has to be exerted on the moving plate, where p is the viscosity of water. The mechanical work produced is then dissipated in the form of... [Pg.40]

Dynein, kinesin, and myosin are motor proteins with ATPase activity that convert the chemical bond energy released by ATP hydrolysis into mechanical work. Each motor molecule reacts cyclically with a polymerized cytoskeletal filament in this chemomechanical transduction process. The motor protein first binds to the filament and then undergoes a conformational change that produces an increment of movement, known as the power stroke. The motor protein then releases its hold on the filament before reattaching at a new site to begin another cycle. Events in the mechanical cycle are believed to depend on intermediate steps in the ATPase cycle. Cytoplasmic dynein and kinesin walk (albeit in opposite... [Pg.16]

While batteries and fuel cells used to be the subject of a chapter in electrochemical books, the decision of the Daimler-Benz company in 1997 to develop fuel cells for the electric drive in their cars brought the fuel cell into clear focus the battery suddenly took second place to environmentally friendly cars. The fuel cell directly converts the energy of chemical reactions to electricity and without moving parts, in contrast to the two-stage method of our present way of obtaining electricity (heat to mechanical work and mechanical work to a generator). Batteries store electricity produced elsewhere, and make it instantly available when a circuit is closed. They have their own market independently of whether they will be used in any automotive applications. [Pg.333]

Transient heating events were important in the formation of the Solar System and provided the energy to produce chondrules and refractory inclusions. These objects are not predicted in astrophysical models for the formation of planetary systems. They comprise 50-80% of the mass of many primitive meteorites. However, the mechanism that produced the transient heating events is still unknown. Future work must focus on putting the details of the petrographic and chemical analysis of these rocks into an astrophysical and cosmochemical framework of Solar System formation. [Pg.22]

The combustion of a hydrocarbon or hydrogen (chemical energy) is accompanied by a rise in temperature as these reactions are exothermic and the reaction products are usually gases. The heat increase causes expansion of the formed gases which in their turn can produce mechanical work by causing the pistons in the ICE to move (or steam is generated to drive a steam cycle). The maximum efficiency of this system is given by the Carnot efficiency, as follows ... [Pg.340]

Explosion is a process in which energy transforms rapidly. Explosion produces stable compounds by transforming chemical energy into heat. The heat is then transformed into the mechanical work of media. Endothermic reactions or exothermic reactions with less heat released are not explosion. For example. [Pg.18]

Chemical Energy Produces Mechanical Work of Lifting Weight (Changing Concentration of Chemical Through the Transition Zone Drives Contraction)... [Pg.151]


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See also in sourсe #XX -- [ Pg.151 , Pg.152 , Pg.153 , Pg.154 , Pg.155 ]




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