Calculate the absolute pressure P of the manometer shown in the Figure in kPa The local atmospheric pressure is 758 mmHg 12 cm 5 cm Fluid A 10 kN m 30 cm Atmospheric pressure 15 cm Fluid B 8 kN m Problem 2 A pressure cooker cooks a lot faster than an ordinary pan by maintaining a higher pressure and temperature inside The lid of a pressure cooker is well sealed and steam can escape only through an opening in the middle of the lid A separate metal piece the petcock sits on top of this opening and prevents steam from escaping until the pressure force overcomes the weight of the petcock The periodic escape of the steam in this manner prevents any potentially dangerous pressure buildup and keeps the pressure inside at a constant value Determine the mass of the petcock of a pressure cooker whose operation pressure is 100 kPa gage and has an opening cross sectional area of 4 mm Express your answer in grams with three significant figures Assume an atmospheric atm 101 kPa Pressure cooker Petcock A 4 mm