解:
铅块到右边的距离:L1=L/2-A
铅块入水后对支架的拉力是:F1=Mg-ρ水gM/ρ铅
根据杠杆平衡条件(以右边为支点):N1'L=F1L1即
N1'L=(Mg-ρ水gM/ρ铅)(L/2-A)
故:N1'=(Mg-ρ水gM/ρ铅)(L/2-A)/L
同理N2'=(Mg-ρ水gM/ρ铅)(L/2+A)/L
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