(1) V 塑料 = V 钢 = m 钢 / ρ =237km/(7.9×10 3 kg/m 3 )="0.03" m 3 (2) m 塑料 = V 塑料 × ρ 塑料 ="0.03" m 3 ×1.1×10 3 kg/m 3 =33 kg (3) 减少的质量:= m 钢 - m 塑料 =237kg-33 kg=207 kg |
(1) V 塑料 = V 钢 = m 钢 / ρ =237km/(7.9×10 3 kg/m 3 )="0.03" m 3 (2) m 塑料 = V 塑料 × ρ 塑料 ="0.03" m 3 ×1.1×10 3 kg/m 3 =33 kg (3) 减少的质量:= m 钢 - m 塑料 =237kg-33 kg=207 kg |