Final answer:
The student's question involves calculating the wind velocity needed to blow over a boxcar using physics principles. However, critical details like the boxcar's dimensions and drag coefficient are missing, making it impossible to solve precisely. The additional context given is general information on drag coefficients and does not assist in answering this specific question.
Step-by-step explanation:
The question appears to involve calculating the wind velocity required to tip over a boxcar, based on its dimensions and possibly its mass. This calculation would involve principles from physics such as force, pressure, and the drag coefficient.
While the relevant dimensions, mass of the boxcar, and value of the drag coefficient are not provided in the question, the general approach would require using the drag equation to calculate the force exerted by the wind on the boxcar and then comparing it to the tipping force which is related to the weight of the boxcar and its center of gravity.
However, due to missing information, a precise calculation cannot be completed.
Regarding the additional contexts provided, these seem largely irrelevant to the specific question asked. They provide general knowledge on the drag coefficient and its effect on vehicles such as cars and airplanes, including details concerning fuel efficiency and historical speed limits set in response to the oil crisis.
These do not contribute to solving the problem at hand but offer background on why understanding drag is important in real-world applications.