Friday, July 31, 2009

Milwaukee Trivia Collection - Back to the Future Edition

People clamor for shorter articles, so I present the first in a series of Milwaukee-oriented trivia collections randomly organized into arbitrary themes. Today: I link Milwaukee's history with Back to the Future because of a note listing the time and date a building was struck by lightning.


Ten Years Early; One DeLorean Short


Flux capacitor not fluxing and out of plutonium? The Wells Building on Wisconsin Avenue was struck by lightning on July 9th, 1945 at 3:45pm. Unfortunately old ladies won't be handing out fliers asking you to save the clocktower; there aren't any clock faces on the building.

Thinking of speeding down Wisconsin Avenue in order to hit a metal wire at 88 miles per hour? Milwaukee's mass transit might have something to say about that. Not only would you have to contend with an abundance of streetcar wires, you'd also have the streetcars themselves, which would still be around for nearly a decade.


"Tab? I can't give you a tab unless you order something."

Putting aside the fact that Marty orders a drink marketed towards women, Tab did not exist until 1963. Coincidentally (in the realm of missing beverages), Milwaukee didn't have any taverns on record in the 1920s. Still want to wet your whistle? The Milwaukee city directories can point you to page after page of soda fountains.


Road names? Where we're going we don't need... road names.

There's plenty of dispute over the origin of the city of Milwaukee's name. But many of the streets have unique stories as well. Some changes came through convention, some came through history, and some came because urban planners like trying to confuse Polish immigrants.

As mentioned previously, Milwaukee went through many street renaming phases, but the most extensive happened in 1930. Almost every East-West street in East Milwaukee had a different name before the 1930s. Directional indicators were appended to street names (making something like Wisconsin Avenue into East Wisconsin Avenue and West Wisconsin Avenue - or something more fun like changing Aldrich Street into East Bay Street and South Bay Street). Unfortunately, they also decided to move the numbered streets as well.


View Larger Map

The city of Milwaukee does not have a Main Street (although Brown Deer Road becomes Main Street in Waukesha County). Broadway was formerly Main Street, before the name was changed in 1871.


The only reasonable explanation is that it's the main street to use to get out of the city, right?

Monday, July 27, 2009

Gravity Gone Ballistic

Some of my paternal grandfather's war stories involved his time in the army. The most action-packed involved a time on patrol when a spent round bounced off his upper chest, and simply fell to the ground because it had effectively lost all of its kinetic energy. More action-packed than stories of siphoning gasoline out of military vehicles, anyway. Strangely, the story has propagated disagreement among people who doubt its veracity. I can't vouch for the authenticity of the story, but I can vouch for its viability.

However, it wasn't enough that people simply believe me on my birthday, so I was forced to break out the W/t of SCIENCE (If I can have a dogion joke I can have a power = energy/time joke). Unfortunately, this led to a point of contention involving the physics of gravity.

Some people are surprised to know that the Aristotelian view of gravity is not true (despite how cool Aristotle is). Heavier objects do not inherently accelerate faster than lighter objects. This belief persists because lighter objects tend to be more buoyant and have more air resistance, and hence drop more slowly on Earth.

Current scientific thinking links gravity with the curvature of spacetime. Unfortunately, quantum mechanics disagrees (but quantum mechanics is like that frizzy-haired uncle no one likes to talk to because he seems to only speak gibberish). Despite all that, most situations still work fine with Newton's "simple" Law of Gravity. Here we also see that laws are meant to be broken, even when they're scientific, since relativity and quantum mechanics have proven that Newton's law does not apply to all possible scenarios. Basically, given a vacuum (to negate air resistance and buoyancy) and objects of negligible mass (relative to a planet), objects will fall to the ground at the same rate (both would fall at approximately 9.8m/s2 on Earth).

Astronauts make everything better, so fortunately the concept was illustrated by our good friend Commander David Scott during the Apollo 15 mission.

Transcript for people without video: "Well, in my left hand I have a feather. In my right hand, a hammer. I guess one of the reasons we got here today was because of a gentleman named Galileo a long time ago, who made a rather significant discovery about falling objects in gravity fields. And we thought, 'Where would be a better place to confirm his findings than on the moon?' And so we thought we'd try it here for you. The feather happens to be appropriately a falcon feather...for our Falcon. And I'll drop the two of 'em here, and - hopefully - they'll hit the ground at the same time. [hammer and feather hit the ground simultaneously] How 'bout that? This proves that mister Galileo was correct in his findings."

Returning to our opening statements: people also tend to believe that horizontal motion negates gravity. If an object is shot horizontally and another object dropped simultaneously from the same height, both objects will hit the ground at the same time. Gravity's pull is uniform regardless of horizontal motion. This too, is illustrated by crazy science teachers around the world. Exhibit A:

(I apologize in advance for the lack of more astronauts)



...There is no Exhibit B.

Edit for 2013-2-06: There is an Exhibit B; I've since become aware that the Mythbusters have also performed this experiment using actual firearms with a result that is well within margin of error (basically the only improvements you could ask for is better timing on the drop/shot simultaneity and doing it in a vacuum).


Randomly teaching people about gravity since 2003; just another reason not to follow me when I walk home from school.