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2. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   Motor oil is a lubricant used in internal combustion engines, which power cars, motorcycles, lawnmowers, engine-generators, and many other machines. In engines, there are parts which move against each other, and the friction between the parts wastes otherwise useful power by converting kinetic energy into heat.

3. Coefficient of performance - Wikipedia

   en.wikipedia.org/wiki/Coefficient_of_performance

   Coefficient of performance. The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. [1] [2] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.

4. Jet engine performance - Wikipedia

   en.wikipedia.org/wiki/Jet_engine_performance

   Jet engine performance. A jet engine performs by converting fuel into thrust. How well it performs is an indication of what proportion of its fuel goes to waste. It transfers heat from burning fuel to air passing through the engine. In doing so it produces thrust work when propelling a vehicle but a lot of the fuel is wasted and only appears as ...

5. Heat engine - Wikipedia

   en.wikipedia.org/wiki/Heat_engine

   A heat engine is a system that converts heat to usable energy, particularly mechanical energy, which can then be used to do mechanical work. [1] [2] While originally conceived in the context of mechanical energy, the concept of the heat engine has been applied to various other kinds of energy, particularly electrical, since at least the late ...

6. Skeletons reveal what life was like for elite scribes in ...

   www.aol.com/skeletal-remains-shed-light-life...

   The Egyptian men assumed one of three positions that became an occupational hazard, the study authors found. Researchers analyzed the remains of 69 men buried at a necropolis in Abusir, Egypt ...

7. Daily mortgage rates for June 28, 2024: Averages rise for 30 ...

   www.aol.com/finance/daily-mortgage-rates-for...

   Average mortgage rates end the week with a moderate rise across popular purchase and refinancing terms, with 30-year terms holding under 7% as of Friday, June 28, 2024, at the same time that new ...