A frame of reference (or reference frame) consists of an abstract coordinate system and the set of physical reference points that uniquely locate and orient the coordinate system and standardize measurements.
It is a physical concept related to an observer and the observer's state of motion.
In n dimensions, n+1 reference points are sufficient to fully define a reference frame.
If the object, ends up with a positive charge, then it is missing electrons. if it is missing electrons, then it must have been removed form the object during the rubbing process.
Answer:
Control valves are used in many processes to control flow, pressure, temperature or other variables. The type of valve used will depend on the size of the pipe, the overall pressure that the system operates, the flowing media, process conditions, and other factors.
Also
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.
<u><em>Hope this helps :)</em></u>
<u><em>Pls brainliest...</em></u>
Organs are made up of different types of organs.
Explanation:
Weight/gravity - Downwards
Normal force - Upwards
keep in mind that the length of the arrows of both the weight and the normal forces have to be equal since these are vectors and are equal to each other to cancel each other out