题目内容
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[主观题]
As long as two forces have the same magnitude and are in opposite directions, these two forces form a couple.
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发布时间：2022-01-07
题目内容
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5. _____ Most of the buildings in Hongcun have an opening on the roof for more sunlight and better air circulation.
第3题
For a polytropic gas described as [图] with initia...
For a polytropic gas described as
with initial data
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connecting
and
with a shock wave or a rarefaction wave.
第4题
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The resultant force of two intersecting forces
and
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第6题
For any coplanar force system, as long as its principal vector is not equal to zero, the force system can be reduced to one single force.
第7题
A rigid body is in equilibrium state under the coplanar force system. Which set of equilibrium equations are not independent of each other? 
A、SX = 0, Sx = 0, SmA(F) = 0
B、SmO(F) = 0, SmA(F) = 0, SmB(F) = 0
C、SmO(F) = 0, SmC(F) = 0, SY = 0
D、SX = 0, SY = 0, SmO(F) = 0
第8题
A rigid body is in equilibrium state under the coplanar force system. Which set of equilibrium equations are not independent of each other? 
A、SX = 0, SmO(F) = 0, SmA(F) = 0
B、SmO(F) = 0, SmA(F) = 0, SmB(F) = 0
C、SmA(F) = 0, SmC(F) = 0, SY = 0
D、SX = 0, SmA(F) = 0, SmB(F) = 0
第9题
The whole system is in equilibrium state. Which set of equilibrium equations is correct? 
A、Study ADB： åmA(F) = NB×2L + YD×L = 0
B、Study the whole system： åmA(F) = - P×(L+r) + NB×2L = 0
C、Study CDE and the pully： åmD(F) = - P×r - T×(L – r) + XE×L + SBC×L×sin30° = 0
D、Study the whole system： åmA(F) = - P×(L+r) + NB×2L - T×(L – r) = 0
第10题
Consider the equilibrium of bar AB. The correct moment equation about point A should be 
A、SmA(F) = m + Psinq × L/2 + M + mA = 0
B、SmA(F) = -m - Psinq × L/2 + M = 0
C、SmA(F) = -mL - P × L/2 + M + mA = 0
D、SmA(F) = -m - Psinq × L/2 + M + mA = 0
