Does a signal called "EN" stand for something special in this circuit?

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The signal "EN" in the circuit likely stands for "enable," suggesting it controls the operation of the circuit. The function represented by the circuit is expressed as ##\bar{(AB+C)EN}##, indicating that the output is dependent on the states of signals A, B, C, and EN. This implies that when EN is active, it enables the combination of signals A and B, along with C, to influence the output. Understanding the role of EN is crucial for analyzing the circuit's behavior. The discussion highlights the importance of signal interpretation in circuit design.
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Homework Statement
Write a boolean expression that describes the function of the circuit below.
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My question is what does "EN" stand for in the circuit?
1702821236064.png

If it is simply a signal like A, B, and C then the function represented by this circuit is ##\bar{(AB+C)EN}##.
 
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Perhaps "enable".
 
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Thread 'Chain falling out of a horizontal tube onto a table'

Thread 'Chain falling out of a horizontal tube onto a table'

My attempt: Initial total M.E = PE of hanging part + PE of part of chain in the tube. I've considered the table as to be at zero of PE. PE of hanging part = ##\frac{1}{2} \frac{m}{l}gh^{2}##. PE of part in the tube = ##\frac{m}{l}(l - h)gh##. Final ME = ##\frac{1}{2}\frac{m}{l}gh^{2}## + ##\frac{1}{2}\frac{m}{l}hv^{2}##. Since Initial ME = Final ME. Therefore, ##\frac{1}{2}\frac{m}{l}hv^{2}## = ##\frac{m}{l}(l-h)gh##. Solving this gives: ## v = \sqrt{2g(l-h)}##. But the answer in the book...
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