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一、厨房中的力学问题例1 小杰家的压力锅盖上标有“××铝制品厂24cm 压力锅”的字样.他测得限压阀的质量是100g,排气孔的直径为3mm,这个压力锅正常工作时内部水蒸气的最大压强相当于大气压的多少倍?锅盖承受的压力至少多大才能保证安全?(大气压强为 p_0=1.01×10~5Pa)分析和解排气孔的面积为 S=πd~2/4;设大气压为 p_0,则高压锅内气体的压强为 p=p_0+mg/S=p_0+4mg/πd~2,将 p_0=1×10~5Pa、m=100g=0.1kg、d=3mm=3×10~(-3)m 等相关数
First, the mechanical problems in the kitchen Example 1 Xiaojie home pressure cooker marked with “× × aluminum factory 24cm pressure cooker ” word. He measured the quality of the pressure limiting valve is 100g, the diameter of the exhaust hole is 3mm When the pressure cooker is working, the maximum pressure of the internal water vapor is equivalent to how many times the atmospheric pressure? How much pressure can the lid withstand to ensure safety? (The atmospheric pressure is p_0=1.01×10~5Pa) The area of analysis and treatment of the exhaust hole is S=πd~2/4; set the atmospheric pressure to p_0, the pressure of the gas in the autoclave is p=p_0+mg/S=p_0+4mg/πd~2, and p_0=1×10~5Pa, m=100g=0.1 Kg, d=3mm=3×10~(-3)m and other related numbers