Inertia; the string and weight are moving with the earth (otherwise they wouldn't be in the same place on the surface for very long). The only force available to act is gravity, which pulls directly downward and makes the bob plumb.
Revolves is rotating around something,
You're referring to the word 'plumb' - as in plumb line.
YES. Level is interpruted to be horizontal and plumb vertical. Now, most levels have a plumb level and can be used in the vertical position. this is stil however checking for plumb and not level. Hope this helps Terry
When something is plumb, it is perfectly vertical or upright, aligning directly with the force of gravity. This term is often used in construction and carpentry to ensure that structures are straight and stable. A plumb line, for example, is a tool that helps achieve this vertical alignment. In essence, being plumb indicates that an object is not leaning or tilted.
The day/night cycle results from the Earth rotating.
Plumb as in "Plumb a door frame or cabinet?" Plumb is having something 90 degrees to level. The floor is level and the door frame, the vertical, up and down part is plumb in relationship to that. I'm sure this term comes from using a Plumb Bob. That's a heavy pointed ball on a string.. It will always show you the plumb line. Haven't heard the term used in plumbing.
no, it's the Earth that is constantly rotating around the Sun
by the earth rotating around the sun while the moon is rotating around the earth.
No, unless something makes it stop. It would take a tremendous amount of energy to make the rotation stop and then start again. There is a law of conservation of rotational momentum; a rotating object like the Earth can't simply stop rotating by itself, it would require an outside force to do that.
The phrase "plumb forgot" likely originated from the use of the word "plumb" as an adverb meaning "completely" or "absolutely." In this context, "plumb" emphasizes the degree to which something is forgotten. The word "plumb" in this sense dates back to the 16th century, while the specific phrase "plumb forgot" likely emerged later as a colloquial expression to convey total forgetfulness.
earth is approximately rotating at 66 and a half degrees
Nothing will happen because of the gravity