For a polytropic gas described aswith initial data, there always exists an intermediate stateconnectingandwith a shock wave or a rarefaction wave.
The resultant force of two intersecting forcesandis, i.e.,. The magnitude ofmust be larger than those ofand.
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
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
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
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
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