Actually the image that he will see depends of the lens used during the experience. But normally with good light and properly focus it would be possible to see the finger prints like in the image.
First off, Newtons dont measure weight, it measures force. Assuming thats a tyo, the answer is 20 N
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>