第一题A、B两个物体分别重100牛和30牛,已知物体B匀速下降,那么物体A收到的摩擦力是第二题用滑轮组提起重物,当绳子自由端移动2m时,发现物体升高了0.5m,物体的质量是20kg,不计滑轮重和摩擦阻

第一题A、B两个物体分别重100牛和30牛,已知物体B匀速下降,那么物体A收到的摩擦力是第二题用滑轮组提起重物,当绳子自由端移动2m时,发现物体升高了0.5m,物体的质量是20kg,不计滑轮重和摩擦阻
第一题A、B两个物体分别重100牛和30牛,已知物体B匀速下降,那么物体A收到的摩擦力是
第二题用滑轮组提起重物,当绳子自由端移动2m时,发现物体升高了0.5m,物体的质量是20kg,不计滑轮重和摩擦阻力,绳子的拉力为
第三题某人到健身房进行活动,（1）A固定不动,在绳子B处用力F2拉绳,使重物G匀速上升（2）B固定不动,在A处用力F1拉绳子,使重物G匀速上升,比较F1和F2的大小
第一幅图为第一题,左边是A,右边是B,第二幅为第三题,上边是B,靠左墙的是物体G,下面的滑轮处是A
图片

第一题A、B两个物体分别重100牛和30牛,已知物体B匀速下降,那么物体A收到的摩擦力是第二题用滑轮组提起重物,当绳子自由端移动2m时,发现物体升高了0.5m,物体的质量是20kg,不计滑轮重和摩擦阻
第一题摩擦力为15,由于是匀速运动,所以摩擦力等于绳头的拉力,由于的动滑轮,拉力减半为15N
第二天绳头移动2米物体上升0.5所以是四倍的关系,物体重20kg就是200N,所以绳头拉力为四分之一200N,为50N
三题1中F2等于2G 2中F1等于G
安重力加速度9.8就是49N

Fantastic function of evil men's fashion
Men's atmosphere is filled with evil
If you're thinking about Men's History that just before several years ago, you might uncover we now have just gone...

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Fantastic function of evil men's fashion
Men's atmosphere is filled with evil
If you're thinking about Men's History that just before several years ago, you might uncover we now have just gone by means of a "bad boy in power" era. Designers together wholesale ,
seduce out the men's "evil" and carry forward in 10 years ago. Currently the men's platform, packed with subversive tribute for the T stage fashion.
"Bad boy here!" It was if the Dior Homme Hedi Slimane took over the title, I believe many individuals will like the devil on his slender cut and keep in mind the typical. If you are thinking about Men's History that before several years back, you will locate we now have just gone via a "bad boy in power" era. Hedi Slimane, Raf Simons, Vivienne Westwood, Jean Paul Gaultier, Marc Jacobs, Alexander McQueen, Rick Owens, Richard Ticsi ... ... these designers will get together in the dozen in years past, men in the "evil" seduce out wholesaler , and carried forward. T at the moment the men's platform, filled with subversive tribute towards the fashion. If the picture of a man but the poor boy about the streets, sometimes brutal punk into a easy youth, but when you live within the "Utopia" in the fight for freedom hippies ... ...
T stage, the well-liked picture of men, they're all packed with the type of terror and destruction wholesale nike air shox .In reality, if you can find personality fashion, then your DNA of his character should use a lengthy genetic chain is "evil and destruction" with the master.

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（1）15N
(2)50N
(3)F1=G,F2=G/2
F1大于F2