EBK PHYSICS FOR SCIENTISTS AND ENGINEER
9th Edition
ISBN: 9780100454897
Author: Jewett
Publisher: YUZU
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Textbook Question
Chapter 21, Problem 21.31P
During the power stroke in a four-stroke automobile engine, the piston is forced down as the mixture of combustion products and air undergoes an adiabatic expansion. Assume (1) the engine is running at 2 500 cycles/min; (2) the gauge pressure immediately before the expansion is 20.0 atm; (3) the volumes of the mixture immediately before and after the expansion are 50.0 cm3 and 400 cm3, respectively (Fig. P21.31); (4) the time interval for the expansion is one-fourth that of the total cycle; and (5) the mixture behaves like an ideal gas with specific heat ratio 1.40. Find the average power generated during the power stroke.
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Chapter 21 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
Ch. 21 - Two containers hold an ideal gas at the same...Ch. 21 - (i) How does the internal energy of an ideal gas...Ch. 21 - Prob. 21.3QQCh. 21 - Prob. 21.4QQCh. 21 - Cylinder A contains oxygen (O2) gas, and cylinder...Ch. 21 - An ideal gas is maintained at constant pressure....Ch. 21 - Prob. 21.3OQCh. 21 - A helium-filled latex balloon initially at room...Ch. 21 - Prob. 21.5OQCh. 21 - Prob. 21.6OQ
Ch. 21 - A sample of gas with a thermometer immersed in the...Ch. 21 - Prob. 21.8OQCh. 21 - Which of the assumptions below is not made in the...Ch. 21 - Hot air rises, so why does it generally become...Ch. 21 - Prob. 21.2CQCh. 21 - When alcohol is rubbed on your body, it lowers...Ch. 21 - What happens to a helium-filled latex balloon...Ch. 21 - Which is denser, dry air or air saturated with...Ch. 21 - One container is filled with helium gas and...Ch. 21 - Daltons law of partial pressures states that the...Ch. 21 - (a) How many atoms of helium gas fill a spherical...Ch. 21 - A cylinder contains a mixture of helium and argon...Ch. 21 - Prob. 21.3PCh. 21 - In an ultrahigh vacuum system (with typical...Ch. 21 - A spherical balloon of volume 4.00 103 cm3...Ch. 21 - A spherical balloon of volume V contains helium at...Ch. 21 - A 2.00-mol sample of oxygen gas is confined to a...Ch. 21 - Oxygen, modeled as an ideal gas, is in a container...Ch. 21 - Prob. 21.9PCh. 21 - The rms speed of an oxygen molecule (O2) in a...Ch. 21 - A 5.00-L vessel contains nitrogen gas at 27.0C and...Ch. 21 - A 7.00-L vessel contains 3.50 moles of gas at a...Ch. 21 - In a period of 1.00 s, 5.00 1023 nitrogen...Ch. 21 - In a constant-volume process, 209 J of energy is...Ch. 21 - A sample of a diatomic ideal gas has pressure P...Ch. 21 - Review. A house has well-insulated walls. It...Ch. 21 - A 1.00-mol sample of hydrogen gas is healed at...Ch. 21 - A vertical cylinder with a heavy piston contains...Ch. 21 - Calculate the change in internal energy of 3.00...Ch. 21 - A 1.00-L insulated bottle is full of tea at 90.0C....Ch. 21 - Review. This problem is a continuation of Problem...Ch. 21 - A certain molecule has f degrees of freedom. Show...Ch. 21 - In a crude model (Fig. P21.23) of a rotating...Ch. 21 - Why is the following situation impossible? A team...Ch. 21 - Prob. 21.25PCh. 21 - A 2.00-mol sample of a diatomic ideal gas expands...Ch. 21 - During the compression stroke of a certain...Ch. 21 - How much work is required to compress 5.00 mol of...Ch. 21 - Air in a thundercloud expands as it rises. If its...Ch. 21 - Why is the following situation impossible? A new...Ch. 21 - During the power stroke in a four-stroke...Ch. 21 - Air (a diatomic ideal gas) at 27.0C and...Ch. 21 - A 4.00-L sample of a diatomic ideal gas with...Ch. 21 - Prob. 21.34PCh. 21 - Prob. 21.35PCh. 21 - Fifteen identical particles have various speeds:...Ch. 21 - Prob. 21.37PCh. 21 - Prob. 21.38PCh. 21 - Prob. 21.39PCh. 21 - Consider a container of nitrogen gas molecules at...Ch. 21 - Prob. 21.41PCh. 21 - Prob. 21.42PCh. 21 - The law of atmospheres states that the number...Ch. 21 - Prob. 21.44APCh. 21 - Prob. 21.45APCh. 21 - The dimensions of a classroom are 4.20 m 3.00 m ...Ch. 21 - The Earths atmosphere consists primarily of oxygen...Ch. 21 - Prob. 21.48APCh. 21 - An air rifle shoots a lead pellet by allowing high...Ch. 21 - Prob. 21.50APCh. 21 - A certain ideal gas has a molar specific heat of...Ch. 21 - Prob. 21.52APCh. 21 - Review. Oxygen at pressures much greater than 1...Ch. 21 - Prob. 21.54APCh. 21 - Model air as a diatomic ideal gas with M = 28.9...Ch. 21 - Review. As a sound wave passes through a gas, the...Ch. 21 - Prob. 21.57APCh. 21 - In a cylinder, a sample of an ideal gas with...Ch. 21 - As a 1.00-mol sample of a monatomic ideal gas...Ch. 21 - A sample consists of an amount n in moles of a...Ch. 21 - Prob. 21.61APCh. 21 - A vessel contains 1.00 104 oxygen molecules at...Ch. 21 - A pitcher throws a 0.142-kg baseball at 47.2 m/s....Ch. 21 - The latent heat of vaporization for water at room...Ch. 21 - A sample of a monatomic ideal gas occupies 5.00 L...Ch. 21 - Prob. 21.66APCh. 21 - Prob. 21.67APCh. 21 - Prob. 21.68APCh. 21 - Prob. 21.69APCh. 21 - On the PV diagram for an ideal gas, one isothermal...Ch. 21 - Prob. 21.71APCh. 21 - Review, (a) H it has enough kinetic energy, a...Ch. 21 - Prob. 21.73APCh. 21 - Prob. 21.74CPCh. 21 - A cylinder is closed at both ends and has...
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- Figure P21.45 shows a cyclic process ABCDA for 1.00 mol of an ideal gas. The gas is initially at Pi = 1.50 105 Pa, Vi = 1.00 103 m3 (point A in Fig. P21.45). a. What is the net work done on the gas during the cycle? b. What is the net amount of energy added by heat to this gas during the cycle? FIGURE P21.45arrow_forwardOne mole of an ideal gas does 3 000 J of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and volume of 25.0 L. Determine (a) the initial volume and (b) the temperature of the gas.arrow_forwardThe compression ratio of an Otto cycle as shown in Figure 21.12 is VA/VB = 8.00. At the beginning A of the compression process, 500 cm3 of gas is at 100 kPa and 20.0C. At the beginning of the adiabatic expansion, the temperature is TC = 750C. Model the working fluid as an ideal gas with = 1.40. (a) Fill in this table to follow the states of the gas: (b) Fill in this table to follow the processes: (c) Identify the energy input |Qh|, (d) the energy exhaust |Qc|, and (e) the net output work Weng. (f) Calculate the efficiency. (g) Find the number of crankshaft revolutions per minute required for a one-cylinder engine to have an output power of 1.00 kW = 1.34 hp. Note: The thermodynamic cycle involves four piston strokes.arrow_forward
- (a) Determine the work done on a gas that expands from i to f as indicated in Figure P19.16. (b) What If? How much work is done on the gas if it is compressed from f to i along the same path? Figure P19.16arrow_forwardIf a gas is compressed isothermally, which of the following statements is true? (a) Energy is transferred into the gas by heat. (b) No work is done on the gas. (c) The temperature of the gas increases. (d) The internal energy of the gas remains constant. (e) None of those statements is true.arrow_forwardA car salesperson claims that a 300-hp engine is a necessary option in a compact car, in place of the conventional 130-hp engine. Suppose you intend to drive the car within speed limits ( 65 mi/h) on flat terrain. How would you counter this sales pitch?arrow_forward
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