Environment and Closure Consider the following program in Scheme: (define f (lambda (x) (lambda (y) (- x y) ) ) ) (let ( (g (f 2)) ;; < (*) (x 3)) (g 4) ) (1) What closure does "(f 2)" return in the line pointed to by the (*) sign? (2) Scheme uses lexical scope rules. Should this program output -2 or -1? If it is -2, explain why it is not -1. If it is -1, explain why it is not -2. Hint: you may assume that the closure is created before the function "g" is called, at the point of "(g (f 2))".

Write a computer program to calculate the three-phase fault current for a fault at f in figure 1.16, with the network normal, and with one line at a time removedproblems 1.1 write a computer program to calculate the three-phase fault current for a fault at f in figure 1.16, with the network normal, and with one line at a time removed 20 power system relaying from service. the positive-sequence impedance data are given in the accompanying table. use the commonly made assumption that all prefault resistance values are (1.0+j0.0) pu, and neglect all resistance values. calculate the contribution to the fault flowing through the cb b and the voltage at that bus. for each calculated case, consider the two possibilities: cb b2 closed or open. the latter is known as the stub-end fault í• figure 1.16 problem 1.1 system data for figure 1.16 from to positive sequence 0.0+j0.1 0.05j0.15 0.04 j0.2 0.01 jo.i 0.015 + j0.15 0.01 j0.19 0.01 +j0.19 0.03+j0.1 0.0+j0.08 6 6 6 from service. the positive-sequence impedance data are given in the accompanying table. use the commonly made assumption that all prefault resistance values are (1.0 + j 0.0) pu, and neglect all resistance values. calculate the contribution to the fault flowing through the cb b1, and the voltage at that bus. for each calculated case, consider the two possibilities: cb b2 closed or open. the latter is known as the “stub-end” fault.

Eye injuries usually occur as a result of all of the following things, except: a) proper machine operation b) battery explosion c) falling or flying debris d) electric welding arc

Which of the following tasks is an audio technician most likely to perform while working on a nature documentary? (select all that apply). eliminating potentially distracting background noise adding sound effects making sure the lighting is adequate for a particular scene changing the narration to better match the mood of the documentary