英语翻译A frictionless inclined plane of length 20m has a maximu
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英语翻译
A frictionless inclined plane of length 20m has a maximum vertical height of 5m.If an object of mass 2kg is placed on the plane,which of the following best approximates the net force it feels?
A frictionless inclined plane of length 20m has a maximum vertical height of 5m.If an object of mass 2kg is placed on the plane,which of the following best approximates the net force it feels?
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length在这里是指斜面的长度.
全句翻译:一个高5米,斜面长度20米的光滑斜面,把一个2公斤的物体放在斜面上,下面哪一个选项最接近它受到的净力?
顺便做个答案,答案显然是5牛顿.两个方向的比例为5米/20米=0.25,2公斤也就是20牛顿,0.25*20牛顿=5牛顿.
再问: 可是答案是5N 啊……貌似不是指斜面的长度 Fnet= mg sinα sinα= 5/20=1/4 ∴ Fnet = 2* 10* 0.25= 5N
再答: 你的物理或许不差,但你的几何真的太差。两个比例都是sin,当然斜面才是sin,现在明白了?
全句翻译:一个高5米,斜面长度20米的光滑斜面,把一个2公斤的物体放在斜面上,下面哪一个选项最接近它受到的净力?
顺便做个答案,答案显然是5牛顿.两个方向的比例为5米/20米=0.25,2公斤也就是20牛顿,0.25*20牛顿=5牛顿.
再问: 可是答案是5N 啊……貌似不是指斜面的长度 Fnet= mg sinα sinα= 5/20=1/4 ∴ Fnet = 2* 10* 0.25= 5N
再答: 你的物理或许不差,但你的几何真的太差。两个比例都是sin,当然斜面才是sin,现在明白了?
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