物理 解方程问题!1.T1sin45* + T2sin45*=2mg (1)T2cos45* -T2cos45*=mg
3个回答
1.(1)T1+T2=2√2mg
T1-T2=√2mg
相加T1=3√2/2mg T2=√2/2mg
2.(1) 平方+(2)平方=T1方(s方+c方)=T1方=5/4mg
T1=√5/2mg
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Sin^2 45°+cos^2 45°=?
计算:(1) 2sin30°+2cos60°+4tan45°;(2) sin30°+co s 2 45°- 1
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