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3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter. mine the fluid gage pressure that mast he maintained in the reservoir. M Fres

3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter. mine the fluid gage pressure that mast he maintained in the reservoir. M Fres

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height of each fluid in that arm. FIGURE P3-38E -39E Repent Proh. 3-38E by replacing air by oil with a specific gravity of 0.69. Noil 340 The gage pressure of the air in the tank shown in Fig. P3-40 is measured to be 65 kPa Determine the differential height k of the mercury column. 70 cm -Water -Oil FIGURE P3-34 65 RPa SG-072 75 em 3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter- mine the fluid gage pressure that must be maintained in the reservoir. Air Water 30 cm Mercury SG- 13.6 3-36 Freshwater and seawater flowing in parallel horizontal pipelines are connected to each ather by a double U-tube Air FIGURE P3-40 Resh 40 cm 341 Repeat Prob. 3-40 for a gage pressure of 45 kPa. 42 The top part of a water tank is divided into two com- partments, as shown in Fig. P3-42 Now a fluid with an unknuwn density is poured into ane side, and the water level tises a certain amount on the other side to compensate for this effect. Based on the final fluid heights shown on the fig- ure, determine the density of the fluid added. Assume the liq- 70 cm Sra water 10 cm -Mercury FIGURE P3-36 uid does not mix with water. 107 CHAPTER 3 the two arms is 32 in, determine the pressure difference between the two tanks. The densities of eil and mercury are 45 lbm/ft' and 848 Ibm/ft', respectively. Urknen liquid 3-45 Pressure is often given in terms of a liquid column and is expressed as "pressure head." Express the standard atmospheric pressure in terms of (a) mercury (SG - 13.6), (b) water (SG = 1.0), and (c) glycerin (SG = 1.26) columns. Explain why we usually use mercury in manometers, 80 cm 95 cm WATER 3-46 A simple experiment has long heen used to demon- strate how negative pressure prevents water from being spilled out of an inverted glass. A glass that is fully filled by water and covered with a thin paper is inverted, as shown in Fig. P3-46. Determine the pressure at the bottom of the glass, and explain why water does not fall out. 50 cm FIGURE P3-42 343 The 500- kg load on the hydraulic lift shown in Fig. P3-43 is to be raised by pouring oil (p = 780 kg/m') into a thin tube. Determine how high h should be in order to begin to raise the weight. Glass 10 c Water LOAD 500 kg A piece uf paper -1.2m I em- FIGURE P3-46 3-47 Two chambers with the same fluid at their hase are separated by a piston whose weight is 25 N, as shown in Fig. P3-47. Calculate the gage pressures in chambers A and 8. FIGURE P3-43 Pistan 344E Two eil tanks are connocted to cach other through a manometer. If the difference between the mercury levels in Air Air D Oil Oil 50 em 10 in 10m 25 cm 1l cm 32 in Water 00 c -Mercury FIGURE P3-44E FIGURE P3-47 108 FLUID MECHANICS 3-50 Consider the system shown in Fig. P3-50. If a change of 0.7 kPa in the pressure of air causes the brine-mercury interface in the right column te drop by 5 mm in the brine level in the right column while the pressure in the brine pipe remains constant, determine the ratio of A-JA,- 3-48 Consider a dauble-fluid manometer attached to an air pipe shown in Fig. P3-48, If the specific gravity of ene fluid is 13.55, determine the specific gravity of the other tluid for the indicated absolute pressure of air. Tuke the atmespheric pressure to be 100 kPa. Answer. 5.0 Air Air (P=76 kPa Rrine add
Transcribed Image Text:height of each fluid in that arm. FIGURE P3-38E -39E Repent Proh. 3-38E by replacing air by oil with a specific gravity of 0.69. Noil 340 The gage pressure of the air in the tank shown in Fig. P3-40 is measured to be 65 kPa Determine the differential height k of the mercury column. 70 cm -Water -Oil FIGURE P3-34 65 RPa SG-072 75 em 3-35 The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. Deter- mine the fluid gage pressure that must be maintained in the reservoir. Air Water 30 cm Mercury SG- 13.6 3-36 Freshwater and seawater flowing in parallel horizontal pipelines are connected to each ather by a double U-tube Air FIGURE P3-40 Resh 40 cm 341 Repeat Prob. 3-40 for a gage pressure of 45 kPa. 42 The top part of a water tank is divided into two com- partments, as shown in Fig. P3-42 Now a fluid with an unknuwn density is poured into ane side, and the water level tises a certain amount on the other side to compensate for this effect. Based on the final fluid heights shown on the fig- ure, determine the density of the fluid added. Assume the liq- 70 cm Sra water 10 cm -Mercury FIGURE P3-36 uid does not mix with water. 107 CHAPTER 3 the two arms is 32 in, determine the pressure difference between the two tanks. The densities of eil and mercury are 45 lbm/ft' and 848 Ibm/ft', respectively. Urknen liquid 3-45 Pressure is often given in terms of a liquid column and is expressed as "pressure head." Express the standard atmospheric pressure in terms of (a) mercury (SG - 13.6), (b) water (SG = 1.0), and (c) glycerin (SG = 1.26) columns. Explain why we usually use mercury in manometers, 80 cm 95 cm WATER 3-46 A simple experiment has long heen used to demon- strate how negative pressure prevents water from being spilled out of an inverted glass. A glass that is fully filled by water and covered with a thin paper is inverted, as shown in Fig. P3-46. Determine the pressure at the bottom of the glass, and explain why water does not fall out. 50 cm FIGURE P3-42 343 The 500- kg load on the hydraulic lift shown in Fig. P3-43 is to be raised by pouring oil (p = 780 kg/m') into a thin tube. Determine how high h should be in order to begin to raise the weight. Glass 10 c Water LOAD 500 kg A piece uf paper -1.2m I em- FIGURE P3-46 3-47 Two chambers with the same fluid at their hase are separated by a piston whose weight is 25 N, as shown in Fig. P3-47. Calculate the gage pressures in chambers A and 8. FIGURE P3-43 Pistan 344E Two eil tanks are connocted to cach other through a manometer. If the difference between the mercury levels in Air Air D Oil Oil 50 em 10 in 10m 25 cm 1l cm 32 in Water 00 c -Mercury FIGURE P3-44E FIGURE P3-47 108 FLUID MECHANICS 3-50 Consider the system shown in Fig. P3-50. If a change of 0.7 kPa in the pressure of air causes the brine-mercury interface in the right column te drop by 5 mm in the brine level in the right column while the pressure in the brine pipe remains constant, determine the ratio of A-JA,- 3-48 Consider a dauble-fluid manometer attached to an air pipe shown in Fig. P3-48, If the specific gravity of ene fluid is 13.55, determine the specific gravity of the other tluid for the indicated absolute pressure of air. Tuke the atmespheric pressure to be 100 kPa. Answer. 5.0 Air Air (P=76 kPa Rrine add
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