中文我就不翻译了.
简单的静力学：
T1 = mg/sin70 = 0.5*9.8/0.94 = 5.2N
T2 = mg ctg70 = 0.5*9.8*0.364 =1.78N
其中T1是挂在房顶的那个.
T2是横向拉的那个
A block with 500g is hanging from the ceiling.There is also
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