Author: EMU (Huang Xiwei) Fei Brother said this is a book topic of Procter & Gamble, I am estimated that it is rumored, and many places are circulating this question:
A bear is free to fall from the wellhead of 20 meters high, with 2 seconds to the bottom of the well, what color is this bear?
This is a recognized standard answer (
http://club.yule.sohu.com/read_art_sub.php?b=iq&a=228237&allchildnum=6):
It is white, because twenty meters for two seconds, so the gravity acceleration there is ten meters per second, the gravity acceleration on the Earth is increasing from the equator, because it is close to the equator, the centrifugal force of the Earth The bigger it. Therefore, gravity will be small. We generally say that the gravity acceleration is 9 o'clock eight meters per second. But the two poles will be higher, so the bear is the polar bears, so it is white. It seems that there is no problem (except "the square of the square" of the meter ", is it true? In fact, everyone has learned from all over, and the editor of junior high school textbooks has no exception. 9.8 The meaning is not 9.8 ~ 10 but said 9.75 ~ 9.85, let alone 9.8 never specifically refer to the gravity acceleration on the equator. When Fei brother told me, we came out of the bus at the entrance of the innovation center, so I gave a gravity acceleration in the equatorial and two poles: one day 86400 seconds, even more than 100,000 seconds. Then the earth is 40,000 kilometers long, the radius is probably 6,000 kilometers, which is six million meters. Use international units. 2pi / t angle speed is more than one thousand seconds, then the equator is accelerated, it is a second to 1,000 meters per 10,000 seconds. Removed by 100 million, it is probably 0.06 meters per second. After the flying brother is like a letter, the car is coming. Go back home to re-use the calculator. It is calculated: Earth's 120,000,000m Earth radius 40,000,000m / 2pi = 6369426 M M-Equatorial line speed 40,000,000 / 86400 second = 463m / s Earth equatorial acceleration 463 * 463 / 6369426 = 0.0336m / s ^ 2 Well, and the results of the spending did not contradict the results. To verify the online, the formula that has been useless for so many years can don't make a mistake: http://www.hjz.com.cn/showArticle.asp? ArticleID = 144 huh, okay. That is to say, this bears can't fall so fast in the Arctic. Announcement is actually a physical idiot that doesn't understand. Besides, who said that Black Bear can't go to the Arctic? Automatic God invented currency, nothing impossible. Ok, let's think about how to do this: 20 meters deep, a bear jumps to the bottom of the well, spent 2 minutes, and ask this bear color. The answer is at http://bbs.snnu.edu.cn/cgi-bin/bbscon?board=teachers&file=m.1085560889.a&num=209&title=179
Author: EMU (Huang Xiwei)
