40) When a process can do nothing productive until it gets permission to enter its critical section but continues to execute an instruction or set of instructions anyway just to test the appropriate variable in order to gain eventual entrance, we say this process is in a .

Consider the usual algorithm to convert an infix expression to a postfix expression. suppose that you have read 10 input characters during a conversion and that the stack now contains these symbols: (5 points) | | | + | | ( | bottom |_*_| now, suppose that you read and process the 11th symbol of the input. draw the stack for the case where the 11th symbol is

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Looking at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way