EBK THERMODYNAMICS: AN ENGINEERING APPR
8th Edition
ISBN: 9780100257054
Author: CENGEL
Publisher: YUZU
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Textbook Question
Chapter 1.11, Problem 104RP
Determine the maximum amount of load, in kg, the balloon described in Prob. 1–101 can carry Answer: 900 kg
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1-99 The force generated by a spring is given by F=kx, where
k is the spring constant and x is the deflection of the spring.
The spring of Fig. Pl–99 has a spring constant of 8 kN/cm.
The pressures are P, = 5000 kPa, P, = 10,000 kPa, and
P = 1000 kPa. If the piston diameters are D, = 8 cm and
D, = 3 cm, how far will the spring be deflected? Answer: 1.72 cm
%3D
D2
P2
Spring -
P3
P1
DI
1-107 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 open-
ing 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 danger-
ous pressure buildup and keeps the pressure inside at a con-
stant 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 mm2. Assume an atmo-
spheric pressure of 101 kPa, and draw the free-body diagram
of the petcock. Answer: 40.8 g
i
e
Patm = 101 kPa
Petcock
-A = 4 mm2
1.
Pressure cooker
1-53 The water in a tank is pressurized by air, and the pres-
sure is measured by a multifluid manometer as shown in
Fig. PI-53. Determine the gage pressure of air in the tank if
h = 0.2 m, h, = 0.3 m, and h, = 0.46 m. Take the densities
of water, oil, and mercury to be 1000 kg/m'. 850 kg/m, and
13.600 kg/m, respectively.
Oil
Aic
Mercuty
FIGURE P1-53
Scanned with CamScanner
at a aeptn oI Y m.
at uic UL
1-56 The absolute pressure in water at a depth of 5 m is
read to be 145 kPa. Determine (a) the local atmospheric pres-
sure, and (b) the absolute pressure at a depth of 5 m in a liq-
uid whose specifc gravity is 0.85 at the same location.
Neglectin
eration,
average
1-64
Scanned with CamScanner
D
FIGURE P1-58E
1-59 The piston diameters in Fig. Pl-58E are D, = 10 cm
and D, = 4 cm. When the pressure in chamber 2 is 2000 kPa
and the pressure in chamber 3 is 700 kPa, what is the pres-
Chapter 1 Solutions
EBK THERMODYNAMICS: AN ENGINEERING APPR
Ch. 1.11 - What is the difference between the classical and...Ch. 1.11 - The value of the gravitational acceleration g...Ch. 1.11 - One of the most amusing things a person can...Ch. 1.11 - An office worker claims that a cup of cold coffee...Ch. 1.11 - 1–5C What is the difference between kg-mass and...Ch. 1.11 - Explain why the light-year has the dimension of...Ch. 1.11 - What is the net force acting on a car cruising at...Ch. 1.11 - 1–8 At 45° latitude, the gravitational...Ch. 1.11 - What is the weight, in N, of an object with a mass...Ch. 1.11 - A 3-kg plastic tank that has a volume of 0.2 m3 is...
Ch. 1.11 - Prob. 11PCh. 1.11 - Prob. 12PCh. 1.11 - Solve Prob. 113 using appropriate software. Print...Ch. 1.11 - A 4-kW resistance heater in a water heater runs...Ch. 1.11 - A 150-lbm astronaut took his bathroom scale (a...Ch. 1.11 - The gas tank of a car is filled with a nozzle that...Ch. 1.11 - Prob. 17PCh. 1.11 - A large fraction of the thermal energy generated...Ch. 1.11 - Prob. 19PCh. 1.11 - 1–20C A can or soft drink at room temperature is...Ch. 1.11 - What is the difference between intensive and...Ch. 1.11 - Is the number of moles of a substance contained in...Ch. 1.11 - Is the state of the air in an isolated room...Ch. 1.11 - The specific weight of a system is defined as the...Ch. 1.11 - What is a quasi-equilibrium process? What is its...Ch. 1.11 - Define the isothermal, isobaric, and isochoric...Ch. 1.11 - Prob. 27PCh. 1.11 - Prob. 28PCh. 1.11 - 1–29C What is specific gravity? How is it related...Ch. 1.11 - 1–31C What are the ordinary and absolute...Ch. 1.11 - Prob. 32PCh. 1.11 - Prob. 33PCh. 1.11 - Prob. 34PCh. 1.11 - Prob. 35PCh. 1.11 - Prob. 36PCh. 1.11 - Prob. 37PCh. 1.11 - Prob. 38PCh. 1.11 - The temperature of a system drops by 45F during a...Ch. 1.11 - Explain why some people experience nose bleeding...Ch. 1.11 - A health magazine reported that physicians...Ch. 1.11 - Someone claims that the absolute pressure in a...Ch. 1.11 - 1–43C Express Pascal’s law, and give a real-world...Ch. 1.11 - Consider two identical fans, one at sea level and...Ch. 1.11 - A vacuum gage connected to a chambee reads 35 kPa...Ch. 1.11 - Prob. 46PCh. 1.11 - 1–47E The pressure in a water line is 1500 kPa....Ch. 1.11 - 1–48E If the pressure inside a rubber balloon is...Ch. 1.11 - A manometer is used to measure the air pressure in...Ch. 1.11 - 1–50 The water in a tank is pressurized by air,...Ch. 1.11 - 1–51 Determine the atmospheric pressure at a...Ch. 1.11 - A 200-pound man has a total foot imprint area of...Ch. 1.11 - The gage pressure in a liquid at a depth of 3 m is...Ch. 1.11 - The absolute pressure in water at a depth of 9 m...Ch. 1.11 - 1–55E Determine the pressure exerted on the...Ch. 1.11 - 1–56 Consider a 70-kg woman who has a total foot...Ch. 1.11 - Prob. 57PCh. 1.11 - The barometer of a mountain hiker reads 750 mbars...Ch. 1.11 - The basic barometer can be used to measure the...Ch. 1.11 - Prob. 61PCh. 1.11 - A gas is contained in a vertical, frictionless...Ch. 1.11 - Reconsider Prob. 158. Using appropriate software,...Ch. 1.11 - Both a gage and a manometer are attached to a gas...Ch. 1.11 - Reconsider Prob. 161. Using appropriate software,...Ch. 1.11 - A manometer containing oil ( = 850 kg/m3) is...Ch. 1.11 - A mercury manometer ( = 13.600 kg/m3) is connected...Ch. 1.11 - Repeat Prob. 165 for a differential mercury height...Ch. 1.11 - The pressure in a natural gas pipeline is measured...Ch. 1.11 - Repeat Prob. 167E by replacing air with oil with a...Ch. 1.11 - Blood pressure is usually measure by wrapping a...Ch. 1.11 - The maximum blood pressure in the upper arm of a...Ch. 1.11 - Prob. 73PCh. 1.11 - Consider a U-tube whose arms are open to the...Ch. 1.11 - Consider a double-fluid manometer attached to an...Ch. 1.11 - Prob. 76PCh. 1.11 - Prob. 77PCh. 1.11 - Calculate the absolute pressure. P1, of the...Ch. 1.11 - Consider the manometer in Fig. 173. If the...Ch. 1.11 - Consider the manometer in Fig. 173. If the...Ch. 1.11 - Consider the system shown in Fig. 177. If a change...Ch. 1.11 - What is the value of the engineering software...Ch. 1.11 - Determine a positive real root of this equation...Ch. 1.11 - Solve this system of three equations with three...Ch. 1.11 - Solve this system of three equations with three...Ch. 1.11 - The reactive force developed by a jet engine to...Ch. 1.11 - A man goes to a traditional market to buy a steak...Ch. 1.11 - What is the weight of a 1-kg substance in N, kN,...Ch. 1.11 - A hydraulic lift is to be used to lift a 1900-kg...Ch. 1.11 - Prob. 92RPCh. 1.11 - Prob. 93RPCh. 1.11 - Prob. 94RPCh. 1.11 - Prob. 95RPCh. 1.11 - Prob. 96RPCh. 1.11 - It is well known that cold air feels much colder...Ch. 1.11 - Reconsider Prob. 1116E. Using appropriate...Ch. 1.11 - A vertical pistoncylinder device contains a gas at...Ch. 1.11 - An air-conditioning system requires a 35-m-long...Ch. 1.11 - The average body temperature of a person rises by...Ch. 1.11 - Balloons are often filled with helium gas because...Ch. 1.11 - Reconsider Prob. 1101. Using appropriate software,...Ch. 1.11 - Determine the maximum amount of load, in kg, the...Ch. 1.11 - The lower half of a 6-m-high cylindrical container...Ch. 1.11 - A vertical, frictionless pistoncylinder device...Ch. 1.11 - A pressure cooker cooks a lot faster than an...Ch. 1.11 - Prob. 108RPCh. 1.11 - Consider a U-tube whose arms are open to the...Ch. 1.11 - Prob. 110RPCh. 1.11 - A water pipe is connected to a double-U manometer...Ch. 1.11 - A gasoline line is connected to a pressure gage...Ch. 1.11 - Repeat Prob. 1110 for a pressure gage reading of...Ch. 1.11 - The average atmosphere pressure on earth is...Ch. 1.11 - Prob. 115RPCh. 1.11 - Prob. 116RPCh. 1.11 - Consider the flow of air through a wind turbine...Ch. 1.11 - The drag force exerted on a car by air depends on...Ch. 1.11 - An apple loses 3.6 kJ of heat as it cools per C...Ch. 1.11 - Consider a fish swimming 5 m below the free...Ch. 1.11 - The atmospheric pressures at the top and the...Ch. 1.11 - Consider a 2.5-m-deep swimming pool. The pressure...Ch. 1.11 - During a heating process, the temperature of an...Ch. 1.11 - At sea level, the weight of 1 kg mass in SI units...
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- 1-80 Consider the manometer in Fig. P1-78. If the specific weight of fluid B is 20 kN/m³. what is the absolute pressure. in kPa, indicated by the manometer when the local atmo- spheric pressure is 720 mmHg?arrow_forward1-108 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 mm². Assume an atmo- spheric pressure of 101 kPa, and draw the free-body diagram of the petcock. Answer: 40.8 g Patm = 101 kPa by air, and the eter as shown in air in the tank if PRESSURE COOKER Petcock -A = 4 mm²arrow_forward1-53 The water in a tank is pressurized by air, and the pres- sure is measured by a multifluid manometer as shown in Fig. Pl-53. Determine the gage pressure of air in the tank if h = 0.2 m, hy = 0.3 m, and h, = 0.46 m. Take the densities of water, oil, and mercury to be 1000 kg/m', 850 kg/m, and 13,600 kg/m', respectively. Oil Aic Water Mercury FIGURE P1-53 Scanned with CamScanner at a deptn o1 Y m.arrow_forward
- 1-73 The gage pressure of the air in the tank shown in Fig. PI-73 is measured to be 80 kPa. Determine the differential height h of the mercury column. Oil 80 kPa SG = 0.72 75 cm Air Water 30 cm -Mercury SG = 13.6 FIGURE P1-73arrow_forward1-75 Consider a double-fluid manometer attached to an air pipe shown in Fig. Pl-75. If the specific gravity of one fluid is 13.55, determine the specific gravity of the other fluid for the indicated absolute pressure of air. Take the atmospheric pressure to be 100 kPa. Answer: 5.0 Air P = 76 kPa 40 cm SG 22 cm SG 13.55arrow_forward1-75 Consider a double-fluid manometer attached to an air pipe shown in Fig. P1-75. If the specific gravity of one fluid is 13.55, determine the specific gravity of the other fluid for the indicated absolute pressure of air. Take the atmospheric pressure to be 100 kPa. Answer: 5.0 Air P = 76 kPa 40 cm SG2 22 сm SG¡ = 13.55arrow_forward
- 1- A right circular cylinder of 0.3 m dia and 0.6 m length with a specific weight of 7500 N/m³ is to float vertically in kerosene of specific weight of 8900 N/m³. The Volume displaced of kerosene is... (a) 0.021 m³ (b) 0.053 m³ (c) 0.042 m³ (d) 0.035marrow_forwardWeight of an object in air is 100 N. The object is placed in a liquid. Increase in volume of liquid is 1.5m3. If specific weight of the liquid is 10N/m3, what is the weight of the object in liquid.arrow_forward1-108 A glass tube is attached to a water pipe, as shown in Fig. P1-108. If the water pressure at the bottom of the tube is 110 kPa and the local atmospheric pressure is 99 kPa, deter- mine how high the water will rise in the tube, in m. Take the density of water to be 1000 kg/m³. Patm = 99 kPa h = ? Water FIGURE P1-108arrow_forward
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