I'm not surprised about the angle-of-attack needing correction. The angle-of-attack is defined as the angle between the average chord (an imaginary line running from the leading edge of the wing to the trailing edge of the wing) and the relative wind. Since changing the flap position changes the position of the trailing edge, the angle-of-attack will also change.
> IMO a teacher being paid $90k a year for 7 hours a day of work,
> 10 months a year, should be working hard to improve.
I don't disagree that she should work to improve, but you are using $90K as if it were a lot of money. According to census data [1], the median household income in San Ramon is $173,519/year and the median rent is $2,557/month.
In San Ramon, you can get paid $65,000/year as an assistant manager at Starbucks without getting a 4 year degree plus teaching credentials.
Plus, how is she earning so much? The San Ramon teacher salary schedule is public: [2]
In my social circle there is a perception that the BART is increasingly unsafe and some people who previously used the BART to commute from East Bay to SF are now driving.
Their perception seems to be born out by the data:
From the Bay Area Rapid Transit Police Department [1]
Aggravated Assault (2019): 112
Aggravated Assault (2022): 114
Relative increase (2019 -> 2022) adjusted for ridership:
I'm not surprised about the angle-of-attack needing correction. The angle-of-attack is defined as the angle between the average chord (an imaginary line running from the leading edge of the wing to the trailing edge of the wing) and the relative wind. Since changing the flap position changes the position of the trailing edge, the angle-of-attack will also change.