1. define a base class to represent a time. a. your class should have instance variables for hours, minutes and seconds. your base class should have a tostring method that displays the time, as well as equals method that compares the time in the clock. create appropriate set and get methods for the class. also create an “addtime” method to the clock (it should have a parameter for hours, minutes, and seconds) b. define a derived class called alarmclock to represent an alarm clock. the alarmclock class should include alarmhour (0 – 24), alarmminute (0 - 59), and alarmsecond (0 - 59). override the “addtime” method to not only call the parent class’s method, but also determine if the alarm has gone off (print a message if it has) c. use the following driver to test the functionalities of your alarmclock:

Explain why it is reasonable to assume that receiving 3 duplicate acks in tcp is an indication that the network is not currently congested.

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.

Apex q: what does a low employment rate indicate? a. not many people are earning high salaries b. not many people are going to college c. not many people are renting their homes d. not many people have jobs