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Intracity transportation

As cities grew and sprawled outward, a major challenge was efficient travel within the city—from home to factories or shops, and then back again. Most transportation infrastructure was used to connect cities to each other, typically by rail or canal. Prior to the 1880s, the most common form of transportation within cities was the omnibus. This was a large, horse-drawn carriage, often placed on iron or steel tracks to provide a smoother ride. While omnibuses worked adequately in smaller, less congested cities, they were not equipped to handle the larger crowds that developed at the close of the century. The horses had to stop and rest, and horse manure became an ongoing problem.

In 1887, Frank Sprague invented the electric trolley, which worked along the same concept as the omnibus, with a large wagon on tracks, but was powered by electricity rather than horses. The electric trolley could run throughout the day and night, like the factories and the workers who fueled them. But it also modernized less important industrial centers, such as the southern city of Richmond, Virginia. As early as 1873, San Francisco engineers adopted pulley technology from the mining industry to introduce cable cars and turn the city’s steep hills into elegant middle-class communities. However, as crowds continued to grow in the largest cities, such as Chicago and New York, trolleys were unable to move efficiently through the crowds of pedestrians ( [link] ). To avoid this challenge, city planners elevated the trolley lines above the streets, creating elevated trains, or L-trains, as early as 1868 in New York City, and quickly spreading to Boston in 1887 and Chicago in 1892. Finally, as skyscrapers began to dominate the air, transportation evolved one step further to move underground as subways. Boston’s subway system began operating in 1897, and was quickly followed by New York and other cities.

Illustration (a) depicts a trolley accident: A man is sprawled in the tracks before a stopped trolley, with several other men coming to his aid while a crowd looks on. Photograph (b) shows three trolleys emerging from an underground tunnel in Boston.
Although trolleys were far more efficient than horse-drawn carriages, populous cities such as New York experienced frequent accidents, as depicted in this 1895 illustration from Leslie’s Weekly (a). To avoid overcrowded streets, trolleys soon went underground, as at the Public Gardens Portal in Boston (b), where three different lines met to enter the Tremont Street Subway, the oldest subway tunnel in the United States, opening on September 1, 1897.

The rise of skyscrapers

The last limitation that large cities had to overcome was the ever-increasing need for space. Eastern cities, unlike their midwestern counterparts, could not continue to grow outward, as the land surrounding them was already settled. Geographic limitations such as rivers or the coast also hampered sprawl. And in all cities, citizens needed to be close enough to urban centers to conveniently access work, shops, and other core institutions of urban life. The increasing cost of real estate made upward growth attractive, and so did the prestige that towering buildings carried for the businesses that occupied them. Workers completed the first skyscraper in Chicago, the ten-story Home Insurance Building, in 1885 ( [link] ). Although engineers had the capability to go higher, thanks to new steel construction techniques, they required another vital invention in order to make taller buildings viable: the elevator. In 1889, the Otis Elevator Company, led by inventor James Otis, installed the first electric elevator. This began the skyscraper craze, allowing developers in eastern cities to build and market prestigious real estate in the hearts of crowded eastern metropoles.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
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cm
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A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
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A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
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you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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Magreth
progressive wave
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A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, U.s. history. OpenStax CNX. Jan 12, 2015 Download for free at http://legacy.cnx.org/content/col11740/1.3
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