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momentum takes into acount both the object's _____________ and _______________.

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As necessary to mechanical industry as steel and steam power was the great market, spread over a wide and diversified area and knit together by efficient means of transportation. This service was supplied to industry by the steamship, which began its career on the Hudson in 1807; by the canals, of which the Erie, opened in 1825, was the most noteworthy; and by the railways, which came into practical operation about 1830.The railways followed the same paths [as the canals]. By 1860, New York had rail connections with Chicago and St. Louis—one of the routes running through the Hudson and Mohawk valleys and along the Great Lakes, the other through Philadelphia and Pennsylvania and across the rich wheat fields of Ohio, Indiana, and Illinois. Baltimore, not to be outdone by her two rivals, reached out over the mountains for the Western trade and in 1857 had trains running into St. Louis.In a summary of this passage, which of the following is a central trend?

[1] By the end of the 1800s, there was a change in the nature of the immigrants coming to the United States. [2] Immigration from Northern Europe—England, Ireland, Germany, and Scandinavia—declined, while immigration from Italy, Russia, and Austria-Hungary grew. [3] In fact, between 1900 and 1910, more than three-fourths of all immigrants came from these three countries. [4] Unfortunately, these countries were far removed from England, the home of our founders, and the immigrants who came from them had a hard time adjusting to life in their new country.Which sentence in the paragraph does not include facts to support the main ideas of the paragraph?

Factory work was not easy. First of all, it involved long hours. Typical factory workers put in twelve-hour days, six days a week, and there were few holidays. Moreover, most workers had to do the same simple tasks over and over each day. At the same time, they had to work fast to keep pace with the machines they tended. Finally, factory work could be dangerous. Fingers, hair, and clothing often got caught in the many gears and belts of machines, making accidents common. Also, textile mills were filled with cotton dust, which damaged the lungs of the workers who breathed it in. Which of these sentences provides key details?

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