5. The green trace shows the path of the pendulum bob over the ground , while the blue trace shows the path in a frame of reference rotating with the plane of the pendulum.
15. Why did we have to stay up late 熬夜 for the football match and the opening ceremony of Asian Games at midnight? Different places have time We call the difference . ( 时差 ) time difference Different Video
21. Practice Beijing +3 7 : 00(P.M.) Doha +8 12 : 00(A.M.) Washington, D.C. -5 11 : 00(A.M.) 12.2 12.1 12.1 time zone time date city When did we watch the opening ceremony of the 15th Asian Games ?
22. 1.Calculate the ( 时差 ): If the two places are both in the same eastern or western time zones ,we use to find the time difference ;If one place is in the eastern time zone, and the other is in the western time zone ,we use . 求区时差 : 同 区相 减 , 异 区相 加 。 conclusion How to calculate the time in different places time difference subtraction addition
23. 2.Calculate the time in one zone: The time in the east is than the time in the west .If we want to calculate the time in the ,we should add the time difference; if we want to calculate the time in the west ,we should the time difference. 求区时:东边的时刻总比西边的时刻 早 。 求 东 边的时刻 加 时差,求 西 边的时刻 减 时差。 earlier east subtract
24. 阿忠在房间打了电话问饭店柜台:“你能告诉我台北和悉尼的时差吗? " 总机: " JUST A MINUTE .. ." 阿忠回了一句: " THANK YOU " ,然後挂断了电话。 Is it funny ? Joke What is the time difference between the two cities ?
25. Movie 《 Around the World in 80 days 》 When Fox returned to London ,he thought he had failed (失败) , but the truth is opposite (相反) . Do you know why? The International Date Line
27. The argument( 争论 )of the First Sunrise of the New Millennium ( 新 千年 -2000 ) Russia OR New Zealand What was the first country to welcome the first sunrise of the new Millennium (2000)? Do you know why?
29. Summary Have you learned some new words and expressions? 时区 -- time zones 时差 -- time difference 国际日期变更线(日界线) The International Date Line 加法 -- addition 减法 -- subtraction
30. 2. How do you calculate the time in other parts of the world? (1). Calculate the . (2). the time difference or the time difference. time difference subtract Add
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32. Homework What time is it right now? What time is it in other places? Sydney, Australia Cairo, Egypt London, UK Los Angeles, USA Shanghai, China Monday evening P.M. PLACE DAY TIME