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3-35 The hydraulic lift in a car repair shop has an output diarneter 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.

3-35 The hydraulic lift in a car repair shop has an output diarneter 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.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Oil FIGURE P3-34 65 kPa SG-072 75 cm 3-35 The hydraulic lift in a car repair shop has an output diarneter of 30 cm and is to lift cars up to 2000 kg. Deter- mine the fluid gage pressare that must be maintained in the reservoir Air Water 30 ca Merury SG- 13.6 3-36 Freshwater and seawater flowing in parallel horizontal pipelines are connected to each ather by a double U-tuhe Air FIGURE P3-40 Resh wter 40 cm 341 Repeat Prob. 3-40 for a gage pressure of 45 kPa. 3-42 The top part of a water tank is divided into two com- partments, as shown in Fig. P3-42. Now a fluid with an unknown density is poured into ane side, and the water level rises 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- Sea- wat 10 cm Mercury FIGURE P3-36 uid does not mix with water. 107 CHAPTER 3 the two arms is 32 in, detemine the pressure difference between the two tanks. The densities of ail and mercury are Unknown Liguid 45 lbm/ft' and 848 Ibm/ft', respectively. 3-45 Pressure is often given in terms of a liquid calumn and is expressed as "pressure head." Express the standard atmospherie 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 mereury 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 expluin 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 kp/m') into a thin tuhe. Determine how high h should be in order to begin to raise the weight. Glass 10 cm Water LOAD 500 kg A piece uf paper -1.2m 1 em FIGURE P3-46 3-47 Two chambers with the same fluid at their base are separated by a piston whose weight is 25 N, as shown in Fig. P3-47. Calculate the gage pressures in chambers A and B. FIGURE P3-43 Piston 344E Two eil tanks are connected to each other through a manometer. If the difference between the mercury levels in A A Air n Oil Oil 50 em 10 in 30 cm 25 cm 30 cm 32 in Water r 90 cm -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 to 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 AJA 3-48 Consider a double-fluid manometer attached to an air pipe shown in Fig. P3-48, If the specific gravity of one fluid is 13.55, determine the specific gravity of the other fluid for the indicated abhsolute pressure of air. Take the atmospheric pressure to be 100 kPa. Answer: 5.0 Air Air (P= 76 kPa 40 em Brine pipe sd1.1 SG, Water 22 em Ara A Area. A SG,= 13.55 Mercury SG- 13.56
Transcribed Image Text:Oil FIGURE P3-34 65 kPa SG-072 75 cm 3-35 The hydraulic lift in a car repair shop has an output diarneter of 30 cm and is to lift cars up to 2000 kg. Deter- mine the fluid gage pressare that must be maintained in the reservoir Air Water 30 ca Merury SG- 13.6 3-36 Freshwater and seawater flowing in parallel horizontal pipelines are connected to each ather by a double U-tuhe Air FIGURE P3-40 Resh wter 40 cm 341 Repeat Prob. 3-40 for a gage pressure of 45 kPa. 3-42 The top part of a water tank is divided into two com- partments, as shown in Fig. P3-42. Now a fluid with an unknown density is poured into ane side, and the water level rises 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- Sea- wat 10 cm Mercury FIGURE P3-36 uid does not mix with water. 107 CHAPTER 3 the two arms is 32 in, detemine the pressure difference between the two tanks. The densities of ail and mercury are Unknown Liguid 45 lbm/ft' and 848 Ibm/ft', respectively. 3-45 Pressure is often given in terms of a liquid calumn and is expressed as "pressure head." Express the standard atmospherie 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 mereury 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 expluin 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 kp/m') into a thin tuhe. Determine how high h should be in order to begin to raise the weight. Glass 10 cm Water LOAD 500 kg A piece uf paper -1.2m 1 em FIGURE P3-46 3-47 Two chambers with the same fluid at their base are separated by a piston whose weight is 25 N, as shown in Fig. P3-47. Calculate the gage pressures in chambers A and B. FIGURE P3-43 Piston 344E Two eil tanks are connected to each other through a manometer. If the difference between the mercury levels in A A Air n Oil Oil 50 em 10 in 30 cm 25 cm 30 cm 32 in Water r 90 cm -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 to 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 AJA 3-48 Consider a double-fluid manometer attached to an air pipe shown in Fig. P3-48, If the specific gravity of one fluid is 13.55, determine the specific gravity of the other fluid for the indicated abhsolute pressure of air. Take the atmospheric pressure to be 100 kPa. Answer: 5.0 Air Air (P= 76 kPa 40 em Brine pipe sd1.1 SG, Water 22 em Ara A Area. A SG,= 13.55 Mercury SG- 13.56
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