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A noun, "helix" originally derives from ancient Greek, although it arrived in English through Latin. Its fundamental meaning is "spiral-shaped" or "a spiral-shaped object."
The word "helicopter" derives from the Greek words "helix" (meaning spiral) and "pteron" (meaning wing).
Introduced by political scientist Elisabeth Noelle-Neumann in 1974, the spiral of science theory attempts to explain how public opinion is formed. It refers to how people will tend to remain silent if it becomes apparent that their views are in the minority. This is how one opinion will become dominant.
The Carnot cycle is a mathematical description of an engine that derives its power from heat.
Silence Silence
Baffles are found inside the muffler. They are used to silence the noise an engine makes while running.
First of all, it's a spiral galaxy, not an spiral galaxy. Second, a spiral galaxy would have a spiral shape, obviously.
So you can tell if the motor is turning (running) just by looking.
Spiral
Silence, of course! :p
The name is silent / silence. If you say anything to silence or where there is silence, you have ended the silence; it disappears.
Silence because when you say something when you are in a silent atmosphere then you are breaking the silence. Therefore it is not silent anymore.