1.) When water is boiled at a pressure of 2.00 atm, the heat of vaporization is 2.20x10-6 and the kg boiling point is 120 C. At this pressure, 1.00 kg of water has a volume of of 1.00x10-3m3 and 1.00 kg of steam has a volume of 0.824 m3. (a) Compute the work done when 1.00 kg of steam is formed at this temperature. (b) Compute the increase in internal energy of the water.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Seatwork #1: Show your step-by-step solution to solve the given problems and box your final answers.
Pattern your solution as shown in sample problems, if possible,
1.) When water is boiled at a pressure of 2.00 atm, the heat of vaporization is 2.20x10-6
and the
kg
boiling point is 120 C. At this pressure, 1.00 kg of water has a volume of of 1.00x10-3m³ and 1.00 kg of
steam has a volume of 0.824 m3. (a) Compute the work done when 1.00 kg of steam is formed at this
temperature. (b) Compute the increase in internal energy of the water.
2.) A room air conditioner has a coefficient of performance of 2.9 on a hot day and uses 850 W of electrical
power. (a) How many joules of heat does the air conditioner remove from the room in one minute? (b)
How many joules of heat does the air conditioner deliver to the hot outside air in one minute? (c) Explain
why your answers to parts (a) and (b) are not the same.
3.) A Carnot heat engine has a thermal efficiency of 0.600, and the temperature of its hot reservoir is 800
K. If 3000 J of heat is rejected to the cold reservoir in one cycle, what is the work output of the engine
during one cycle?
4.) A gasoline engine takes in 1.61x104 J of heat and delivers 3700 J of work per cycle. The heat is
obtained by burning gasoline with a heat of combustion of 4.60x104. (a) What is the thermal efficiency?
(b) How much heat is discarded in each cycle? (c) What mass of fuel is burned in each cycle? (d) If the
engine goes through 60.0 cycles per second, what is its power output in kilowatts and in horsepower?
Transcribed Image Text:Seatwork #1: Show your step-by-step solution to solve the given problems and box your final answers. Pattern your solution as shown in sample problems, if possible, 1.) When water is boiled at a pressure of 2.00 atm, the heat of vaporization is 2.20x10-6 and the kg boiling point is 120 C. At this pressure, 1.00 kg of water has a volume of of 1.00x10-3m³ and 1.00 kg of steam has a volume of 0.824 m3. (a) Compute the work done when 1.00 kg of steam is formed at this temperature. (b) Compute the increase in internal energy of the water. 2.) A room air conditioner has a coefficient of performance of 2.9 on a hot day and uses 850 W of electrical power. (a) How many joules of heat does the air conditioner remove from the room in one minute? (b) How many joules of heat does the air conditioner deliver to the hot outside air in one minute? (c) Explain why your answers to parts (a) and (b) are not the same. 3.) A Carnot heat engine has a thermal efficiency of 0.600, and the temperature of its hot reservoir is 800 K. If 3000 J of heat is rejected to the cold reservoir in one cycle, what is the work output of the engine during one cycle? 4.) A gasoline engine takes in 1.61x104 J of heat and delivers 3700 J of work per cycle. The heat is obtained by burning gasoline with a heat of combustion of 4.60x104. (a) What is the thermal efficiency? (b) How much heat is discarded in each cycle? (c) What mass of fuel is burned in each cycle? (d) If the engine goes through 60.0 cycles per second, what is its power output in kilowatts and in horsepower?
Assignment #1. Show your step-by-step solution to solve the given problems and box your final answers.
Pattern your solution as shown in sample problems, if possible.
If this is a discussion question, answer the problem concisely and justify with relevant examples.
1.) In which situation must you do more work: inflating a balloon at sea level or inflating the same balloon
to the same volume at the summit of Mt. Pulag? Explain in terms of pressure and volume change.
2.) A system is taken from state a to state b along the three paths shown. (a) Along which path is the
work done by the system the greatest? The least? (b) If Ub > Ua, along which path is the absolute value
of the heat transfer, JQ| , the greatest? For this path, is heat absorbed or liberated by the system?
V.
3.) When a gas surrounded by air is compressed or expands adiabatically, its temperature rises or
decreased even though there is no heat input or dissipated to the gas. Where does the energy come
from to raise or lower the temperature?
4.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged
in? Why can a refrigerator be set on the floor and plugged in?
5.) Does a refrigerator full of food consume more power if the room temperature is 20°C than if it is
15°C? Or is the power consumption the same? Explain your reasoning.
6.) What would be the efficiency of a Carnot engine operating with TH = Tc? What would be the efficiency
if Tc = 0K and TH were any temperature above 0 K? Interpret your answers.
Transcribed Image Text:Assignment #1. Show your step-by-step solution to solve the given problems and box your final answers. Pattern your solution as shown in sample problems, if possible. If this is a discussion question, answer the problem concisely and justify with relevant examples. 1.) In which situation must you do more work: inflating a balloon at sea level or inflating the same balloon to the same volume at the summit of Mt. Pulag? Explain in terms of pressure and volume change. 2.) A system is taken from state a to state b along the three paths shown. (a) Along which path is the work done by the system the greatest? The least? (b) If Ub > Ua, along which path is the absolute value of the heat transfer, JQ| , the greatest? For this path, is heat absorbed or liberated by the system? V. 3.) When a gas surrounded by air is compressed or expands adiabatically, its temperature rises or decreased even though there is no heat input or dissipated to the gas. Where does the energy come from to raise or lower the temperature? 4.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in? 5.) Does a refrigerator full of food consume more power if the room temperature is 20°C than if it is 15°C? Or is the power consumption the same? Explain your reasoning. 6.) What would be the efficiency of a Carnot engine operating with TH = Tc? What would be the efficiency if Tc = 0K and TH were any temperature above 0 K? Interpret your answers.
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