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一、公式法例1(福州市中考题)建设工地的压桩机常会用到一种如下图所示的长方体混凝土块。求:(1)混凝土块的体积;(2)混凝土块的质量;(3)混凝土块受到的重力;(4)混凝土块平放时对地面的压强。(混凝土的密度为2.8×10~3kg/m~3)分析:利用公式计算是物理计算题的特征。本题已知长方体混凝土块的长、宽、高,可求其体积;根据公式m=ρV可求其质量;根据公式G=mg可求其重力;混凝土块平放时对地面的压力等于其自身的重
First, the formula law 1 (Fuzhou senior high school entrance examination questions) Construction site pile drivers often use a rectangular concrete block as shown below. Seeking: (1) the volume of the concrete block; (2) the mass of the concrete block; (3) the gravity of the concrete block; and (4) the pressure on the ground when the concrete block is laid flat. (Concrete density of 2.8 × 10 ~ 3kg / m ~ 3) Analysis: The use of formula calculation is the characteristics of physics calculation problems. According to the formula m = ρV can ask for its quality; according to the formula G = mg can ask for its gravity; concrete block lying on the ground when the pressure equal to its own Heavy