There are ______ main political parties in the USA.
The Prime Minister who used to say to the Cabinet of Ministers: «When I want your opinion, I’ll give it to you!» is…
The change in velocity over time is…
A stage through which a bill has to go before it becomes an Act of the British Parliament is called …
The Canadian national currency is the …
There’s a regular air-service ________ those two cities.
The force that you exert on the Earth as a result of gravity acting on your body is…
A famous American writer of wit short stories with clever twist endings is …
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A heat engine
1. In thermodynamics, a heat engine is a system that performs the conversion of heat or thermal energy to mechanical work. It does this by bringing a working substance from a high temperature state to a lower temperature state. A heat «source» generates thermal energy that brings the working substance in the high temperature state. The working substance generates work in the «working body» of the engine while transferring heat to the colder «sink» until it reaches a low temperature state. During this process some of the thermal energy is converted into work by exploiting the properties of the working substance. The working substance can be any system with a non-zero heat capacity, but it usually is a gas or liquid.
2. In general an engine converts energy to mechanical work. Heat engines distinguish themselves from other types of engines by the fact that their efficiency is fundamentally limited by Carnot’s theorem. Although this efficiency limitation can be a drawback, an advantage of heat engines is that most forms of energy can be easily converted to heat by processes like exothermic reactions (such as combustion), absorption of light or energetic particles, friction, dissipation and resistance. Since the heat source that supplies thermal energy to the engine can thus be powered by virtually any kind of energy, heat engines are very versatile and have a wide range of applicability.
3. Heat engines are often confused with the cycles they attempt to mimic. Typically when describing the physical device the term «engine» is used. When describing the model the term «cycle» is used.
Their car is at the garage. It _______ now.