主题评价:
  • 0 次(票) - 平均星级: 0
  • 1
  • 2
  • 3
  • 4
  • 5
Opinion, Americas, Special Report
#1
First, gravity is a force that causes objects to attract one another. The simplest way to understand gravity is through Isaac Newton's law of universal gravitation. This law states that every particle in the universe attracts every other particle. The more massive an object is, the more strongly it attracts other objects. The closer objects are, the more strongly they attract each other. An enormous object, like the Earth, easily attracts objects that are close to it, like apples hanging from trees. Scientists haven't decided exactly what causes this attraction, but they believe it exists everywhere in the universe. Second, air is a fluid that behaves essentially the same way liquids do. Like liquids, air is made of microscopic particles that move in relation to one another. Air also moves like water does -- in fact, some aerodynamic tests take place underwater instead of in the air. The particles in gasses, like the ones that make up air, are simply farther apart and move faster than the particles in liquids.




7383400 7297200
2802532 6551096
1647674 7518088
4504545 8470008
383636 7396237
7380267 2728849
3320166 1589668
2283773 8920328
2580520 8947938
2170604 2825685
9524440 6119975
6978986 5166425
437176 5335359
9453766 5110744
5884175 608414
3011144 3971674
1113281 9058694
5236426 7084819
7302634 6588904
3118989 4329927
6042221 9611050
8597257 2258057
1855616 7072423
5531761 3304707
131506 9470541
1676285 50092
297674 4099208
1761310 4993059
6580903 8223148
272518 8819275
1202709 4423936
5016904 2617383
7340486 4808559
5079828 2018778
1724492 3326119
9252748 3737472
9177521 7890114
3542218 7464019
3982671 6541261
8833767 8592767
5379935 4354399
2330682 9745847
7075380 322778
8827435 1568149
3077503 5927158
451658 5751720
4716220 9619128
5923857 5777713
6192955 3924415
2975976 3318197
8493392 4392810
9976351 788759
4017472 2119917
5396059 3010305
6760984 4042363


http://www.reo14.moe.go.th/phpBB3/viewto...&t=3374848
http://reacharound.club/viewtopic.php?f=4&t=89365
https://newworldrpg.net/showcase-artwork...t/new/#new
https://forum.freeisrael.org.il/viewtopi...0&t=108937
https://forum.agromex.info.pl/showthread...711#pid711
http://aena.at/phpbb3/viewtopic.php?f=2&...0#p3164360
https://kropamu.eu/showthread.php?tid=46...81#pid2781
http://166552.com/viewthread.php?tid=405...a=page%3D1
https://frokeninvestera.se/kryptovalutor...ment-59778
http://thereceng.com/webboard/viewtopic....1&t=231664
http://forum.olimpia-kowary.pl/viewtopic...6&t=213341
http://www.veterans-zone.com/forum/index...lifestyle/
https://dev-phpbb2.86it.us/viewtopic.php...460#535460
http://gelezinfon.mobi/showthread.php?ti...9#pid10399
https://gisforum.pp.ua/viewtopic.php?f=7&t=13090
回复


论坛跳转:


正在浏览该主题的用户: 1 个游客