During the 2008 u. s. presidential campaign, hackers were able to gain access to an email account of vice presidentialcandidate, sarah palin. their attack is said to have involved tricking the mail system to reset governor palin's password, claiming they were really palin and had forgotten this password. the system asked the hackers a number of personalquestions regarding palin’s identity, including her birthday, zip code, and a personal security question—"where did youmeet your spouse? "—a|| of which the hackers were able to answer using data available on the internet. what kind ofattack is this an example of? also, what degree of security is provided by a password reset feature such as this?

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?