神马作文网一道物理题,怎么做.有图 .英文题目
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一道物理题,怎么做.有图 .英文题目
After a skiing accident, your leg is in a cast and supported in a traction device, as shown in the figure.
问题： Find the magnitude of the force F exerted by the leg on the small pulley. (By Newton's third law, the small pulley exerts an equal and opposite force on the leg.) Let the mass m be 2.10 kg, and the angle θ be 35.0°.
图： http://www.webassign.net/walker/06-22alt.gif
After a skiing accident, your leg is in a cast and supported in a traction device, as shown in the figure.
问题： Find the magnitude of the force F exerted by the leg on the small pulley. (By Newton's third law, the small pulley exerts an equal and opposite force on the leg.) Let the mass m be 2.10 kg, and the angle θ be 35.0°.
图： http://www.webassign.net/walker/06-22alt.gif
这是物理牵引的原理.
也就是说如果你的脚受伤了,需要拉筋,做牵引的话应该怎么做.
如果m的质量是2.10 Kg,并且成35度角
那么你的脚受到多少牵引力呢?
F＝2（mg）^2(1-cos70)的平方根
=24牛顿
相当于2.4KG的重物直接吊在你的脚上.
也就是说如果你的脚受伤了,需要拉筋,做牵引的话应该怎么做.
如果m的质量是2.10 Kg,并且成35度角
那么你的脚受到多少牵引力呢?
F＝2（mg）^2(1-cos70)的平方根
=24牛顿
相当于2.4KG的重物直接吊在你的脚上.