球解答~
追答1、解:(1)F浮 = G – F = 9.8N – 7.84N = 1.96N
(2) V排 = F浮 /ρ水g = 1.96N / 1.0×103kg/m3×9.8N/kg = 2×10-4m3
V石 = 2 V排 = 2×2×10-4m3 = 4×10-4m3
m石 = G / g = 9.8N / 9.8N/kg = 1 kg
ρ水 = m石 / V石 = 1 kg / 4×10-4m3 = 2.5×103kg/m3
(3)F浮 = ρ煤油V排g = 0.8×103kg/m3×9.8N/kg×4×10-4m3 = 3.136N
F示 = 9.8N - 3.136N = 6.664N
2、解:(1)m = ρ木V = 0.6×103kg/m3×0.2m3 = 120kg
G = mg = 120kg ×10N/kg = 1200N
(2) F浮 = G = 1200N
(3)V排 = F浮 /ρ水g = 1200N / 1.0×103kg/m3×10N/kg = 0.12 m3
V露 = V木 - V排 = 0.2m3 --- 0.12 m3 = 0.08 m3