All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
engineering
mechanical engineering

Questions and Answers of Mechanical Engineering

A spring-loaded piston/cylinder arrangement contains R-134a at 20C, 24% quality with a volume 50 L. The setup is heated and thus expands, moving the piston. It is noted that when the last
A cylinder containing 1 kg of ammonia has an externally loaded piston. Initially the ammonia is at 2 MPa, 180C and is now cooled to saturated vapor at 40C, and then further cooled to
A vertical cylinder has a 90-kg piston locked with a pin trapping 10 L of R-22 at 10C, 90% quality inside. Atmospheric pressure is 100 kPa, and the cylinder cross-sectional area is 0.006 m2.
A piston/cylinder has 1 kg of R-134a at state 1 with 110C, 600 kPa, and is then brought to saturated vapor, state 2, by cooling while the piston is locked with a pin. Now the piston is
Consider the process described in Problem 3.49. With the ammonia as a control mass, determine the boundary work during the process.
Find the work for Problem 3.52.
Find the work for Problem 3.53.
Find the work for Problem 3.55.
Find the work for Problem 3.56.
A spherical elastic balloon initially containing 5 kg ammonia as saturated vapor at 20C is connected by a valve to a 3-m3 evacuated tank. The balloon is made such that the pressure inside is
A 0.5-m-long steel rod with a 1-cm diameter is stretched in a tensile test. What is the required work to obtain a relative strain of 0.1%? The modulus of elasticity of steel is 2 108
A film of ethanol at 20C has a surface tension of 22.3mN/m and is maintained on a wire frame. Consider the film with two surfaces as a control mass and find the work done when the wire is
A simple magnetic substance is one involving only magnetic work, that is, a change in magnetization of a substance in the presence of a magnetic field. For such a substance undergoing a quasi
For the magnetic substance described in Problem 4.41, determine the work done in a process at constant magnetic field intensity (temperature varies), instead of one at constant temperature.
A battery is well insulated while being charged by 12.3 V at a current of 6 A. Take the battery as a control mass and find the instantaneous rate of work and the total work done over 4 hours.
Two springs with same spring constant are installed in a mass less piston/cylinder with the outside air at 100 kPa. If the piston is at the bottom, both springs are relaxed and the second spring
Consider the process of inflating a helium balloon, as described in Problem 3.14. For a control volume that consists of the space inside the balloon, determine the work done during the overall
A cylinder, Acyl 7.012 cm2, has two pistons mounted, the upper one, mp1 100 kg, initially resting on the stops. The lower piston, mp2 0 kg, has 2 kg
The sun shines on a 150 m2 road surface so it is at 45C. Below the 5 cm thick asphalt, average conductivity of 0.06 W/m K, is a layer of compacted rubbles at a temperature of 15C.
A pot of steel, conductivity 50 W/m K, with a 5 mm thick bottom is filled with 15C liquid water. The pot has a diameter of 20 cm and is now placed on an electric stove that delivers 250 W as
A water-heater is covered up with insulation boards over a total surface area of 3 m2. The inside board surface is at 75C and the outside surface is at 20C and the board material has
You drive a car on a winter day with the atmospheric air at –15C and you keep the outside front windshield surface temperature at + 2C by blowing hot air on the inside surface. If
A large condenser (heat exchanger) in a power plant must transfer a total of 100 MW from steam running in a pipe to sea water being pumped through the heat exchanger. Assume the wall separating the
The black grille on the back of a refrigerator has a surface temperature of 35C with a total surface area of 1 m2. Heat transfer to the room air at 20C takes place with an average
Due to a faulty door contact the small light bulb (25 W) inside a refrigerator is kept on and limited insulation lets 50 W of energy from the outside seep into the refrigerated space. How much of a
The brake shoe and steel drum on a car continuously absorbs 25 W as the car slows down. Assume a total outside surface area of 0.1 m2 with a convective heat transfer coefficient of 10 W/m2 K to the
A wall surface on a house is at 30C with an emissivity of = 0.7. The surrounding ambient to the house is at 15C, average emissivity of 0.9. Find the rate of radiation
A log of burning wood in the fireplace has a surface temperature of 450C. Assume the emissivity is 1 (perfect black body) and find the radiant emission of energy per unit surface area.
A radiant heat lamp is a rod, 0.5 m long and 0.5 cm in diameter, through which 400 W of electric energy is deposited. Assume the surface has an emissivity of 0.9 and neglect incoming radiation. What
Consider a window-mounted air conditioning unit used in the summer to cool incoming air. Examine the system boundaries for rates of work and heat transfer, including signs.
Consider a hot-air heating system for a home. Examine the following systems for heat transfer.
Consider a household refrigerator that has just been filled up with room temperature food. Define a control volume (mass) and examine its boundaries for rates of work and heat transfer, including
A room is heated with an electric space heater on a winter day. Examine the following control volumes, regarding heat transfer and work, including sign.
A cylinder fitted with a frictionless piston contains 10 lbm of superheated refrigerant R-134a vapor at 100 lbf/in 2, 300 F. The setup is cooled at constant pressure until the water reaches a quality
An escalator raises a 200 lbm bucket of sand 30 ft in 1 minute. Determine the total amount of work done and the instantaneous rate of work during the process.
A linear spring, F = ks(x - xo), with spring constant ks = 35 lbf/ft, is stretched until it is 2.5 in. longer. Find the required force and work input.
The piston/cylinder shown in Fig P4.12 contains carbon dioxide at 50 lbf/in 2, 200 F with a volume of 5 ft3. Mass is added at such a rate that the gas compresses according to the relation PV1.2
Consider a mass going through a polytropic process where pressure is directly proportional to volume (n = 1). The process start with P = 0, V = 0 and ends with P = 90 lbf/in 2, V =
The gas space above the water in a closed storage tank contains nitrogen at 80 F, 15 lbf/in 2. Total tank volume is 150 ft3 and there is 1000 lbm of water at 80 F additional 1000 lbm water is now
A steam radiator in a room at 75 F has saturated water vapor at 16 lbf/in 2 flowing through it, when the inlet and exit valves are closed. What are the pressure and the quality of the water, when it
Consider a two-part process with an expansion from 3 to 6 ft3 at a constant pressure of 20 lbf/in 2 followed by an expansion from 6 to 12 ft3 with a linearly rising pressure from 20 lbf/in 2 ending
A cylinder having an initial volume of 100 ft3 contains 0.2 lbm of water at 100 F. The water is then compressed in an isothermal quasi-equilibrium process until it has a quality of 50%. Calculate the
Air at 30 lbf/in 2, 85 F is contained in a cylinder/piston arrangement with initial volume 3.5 ft3. The inside pressure balances ambient pressure of 14.7 lbf/in 2 plus an externally imposed force
A cylinder containing 2 lbm of ammonia has an externally loaded piston. Initially the ammonia is at 280 lbf/in 2, 360 F and is now cooled to saturated vapor at 105 F, and then further cooled to 65 F,
A piston/cylinder has 2 lbm of R-134a at state 1 with 200 F, 90 lbf/in 2, and is then brought to saturated vapor, state 2, by cooling while the piston is locked with a pin. Now the piston is balanced
Find the work for Problem 3.82.
Find the work for Problem 3.83.
A 1-ft-long steel rod with a 0.5-in. diameter is stretched in a tensile test. What is the required work to obtain a relative strain of 0.1%? The modulus of elasticity of steel is 30
The sun shines on a 1500 ft2 road surface so it is at 115 F. Below the 2 inch thick asphalt, average conductivity of 0.035 Btu/h ft F, is a layer of compacted rubbles at a temperature of 60 F. Find
A water-heater is covered up with insulation boards over a total surface area of 30 ft2. The inside board surface is at 175 F and the outside surface is at 70 F and the board material has a
The black grille on the back of a refrigerator has a surface temperature of 95 F with a total surface area of 10 ft2. Heat transfer to the room air at 70 F takes place with an average convective heat
A hydraulic hoist raises a 1750 kg car 1.8 m in an auto repair shop. The hydraulic pump has a constant pressure of 800 kPa on its piston. What is the increase in potential energy of the car and how
Airplane takeoff from an aircraft carrier is assisted by a steam driven piston/cylinder with an average pressure of 750 kPa. A 3500 kg airplane should be accelerated from zero to a speed of 30 m/s
Solve Problem 5.2, but assume the steam pressure in the cylinder starts at 1000 kPa, dropping linearly with volume to reach 100 kPa at the end of the process.
A piston motion moves a 25 kg hammerhead vertically down 1 m from rest to a velocity of 50 m/s in a stamping machine. What is the change in total energy of the hammerhead?
A 25 kg piston is above a gas in a long vertical cylinder. Now the piston is released from rest and accelerates up in the cylinder reaching the end 5 m higher at a velocity of 25 m/s. The gas
Find the missing properties a. H2O T 250C, v 0.02 m3/kg P ? u ? b. N2 T 277C, P 0.5
Find the missing properties and give the phase of the substance a. H2O u 2390 kJ/kg, T 90C h ? v ? x ? b.
Find the missing properties and give the phase of the substance a. H2O T = 120C, v = 0.5 m3/kg u = ? P = ? x = ? b. H2O T 100C, P 10 MPa u
Find the missing properties among (P, T, v, u, h) together with x if applicable and give the phase of the substance. a. R-22 T 10C, u 200 kJ/kg b. H2O T
A 100-L rigid tank contains nitrogen (N2) at 900 K, 6 MPa. The tank is now cooled to 100 K. What are the work and heat transfer for this process?
Water in a 150-L closed, rigid tank is at 100C, 90% quality. The tank is then cooled to 10C. Calculate the heat transfer during the process.
A cylinder fitted with a frictionless piston contains 2 kg of superheated refrigerant R- 134a vapor at 350 kPa, 100C. The cylinder is now cooled so the R-134a remains at constant pressure
A test cylinder with constant volume of 0.1 L contains water at the critical point. It now cools down to room temperature of 20C. Calculate the heat transfer from the water.
Ammonia at 0C, quality 60% is contained in a rigid 200-L tank. The tank and ammonia is now heated to a final pressure of 1 MPa. Determine the heat transfer for the process.
A 10-L rigid tank contains R-22 at 10C, 80% quality. A 10-A electric current (from a 6-V battery) is passed through a resistor inside the tank for 10 min, after which the R-22
A piston/cylinder arrangement contains 1 kg of water, shown in Fig. P5.16. The piston is spring loaded and initially rests on some stops. A pressure of 300 kPa will just float the piston and, at a
A closed steel bottle contains ammonia at 20C, x 20% and the volume is 0.05 m3. It has a safety valve that opens at a pressure of 1.4 MPa. By accident, the bottle is
A piston/cylinder arrangement B is connected to a 1-m3 tank A by a line and valve, shown in Fig. P5.18. Initially both contain water with A at 100 kPa, saturated vapor and B at 400C, 300 kPa,
Consider the same setup and initial conditions as in the previous problem, assuming that the process is adiabatic find the final temperature and work.
A vertical cylinder fitted with a piston contains 5 kg of R-22 at 10C. Heat is transferred to the system, causing the piston to rise until it reaches a set of stops at which point the volume
A piston/cylinder contains 50 kg of water at 200 kPa with a volume of 0.1 m3. Stops in the cylinder are placed to restrict the enclosed volume to 0.5 m3 similar to Fig. P5.20, the water is now heated
Ten kilograms of water in a piston/cylinder with constant pressure is at 450C and a volume of 0.633 m3. It is now cooled to 20C. Show the P–v diagram and find the work and heat
Find the heat transfer in Problem 4.10.
Find the heat transfer in Problem 4.24.
A piston/cylinder contains 1 kg of liquid water at 20C and 300 kPa. There is a linear spring mounted on the piston such that when the water is heated the pressure reaches 3 MPa with a volume
An insulated cylinder fitted with a piston contains R-12 at 25C with a quality of 90% and a volume of 45 L. The piston is allowed to move, and the R-12 expands until it exists as saturated
Two kilograms of nitrogen at 100 K, x 0.5 is heated in a constant pressure process to 300 K in a piston/cylinder arrangement. Find the initial and final volumes and the total heat
A piston/cylinder arrangement has the piston loaded with outside atmospheric pressure and the piston mass to a pressure of 150 kPa. It contains water at 2C, which is then heated until
Consider the system shown in Fig. P5.29. Tank A has a volume of 100 L and contains saturated vapor R-134a at 30C. When the valve is cracked open, R-134a flows slowly into cylinder B, the
A spherical balloon contains 2 kg of R-22 at 0C, 30% quality. This system is heated until the pressure in the balloon reaches 600 kPa. For this process, it can be assumed that the pressure in
A piston held by a pin in an insulated cylinder contains 2 kg water at 100C, quality 98%. The piston has a mass of 102 kg, with cross-sectional area of 100 cm2, and the ambient pressure is
A piston/cylinder arrangement has a linear spring and the outside atmosphere acting on the piston, shown in Fig. P5.32. It contains water at 3 MPa, 400C with the volume being 0.1 m3. If the
A vertical piston/cylinder has a linear spring mounted. The spring is mounted so at zero cylinder volume a balancing pressure inside is 100 kPa. The cylinder contains 0.5 kg of water at 125C,
Two heavily insulated tanks are connected by a valve. Tank A contains 0.6 kg of water at 300 kPa 300C. Tank B has a volume of 300 L and contains water at 600 kPa, 80% quality. The valve is
A piston/cylinder contains 1 kg of ammonia at 20C with a volume of 0.1 m3. Initially the piston rests on some stops with the top surface open to the atmosphere, Po, so a pressure of 1400 kPa
A rigid tank is divided into two rooms by a membrane, both containing water. Room A is at 200 kPa, v 0.5 m3/kg, VA 1 m3, and room B contains 3.5 kg at 0.5 MPa,
A cylinder/piston arrangement contains 5 kg of water at 100C with x 20% and the piston, mP 75 kg, resting on some stops, similar to Fig. P5.35, the outside
Two tanks are connected by a valve and line. The volumes are both 1 m3 with R-134a at 20C, quality 15% in A and tank B is evacuated. The valve is opened and saturated vapor flows from A into
Consider the same system as in the previous problem. Let the valve be opened and transfer enough heat to both tanks so all the liquid disappears. Find the necessary heat transfer.
A cylinder having a piston restrained by a linear spring contains 0.5 kg of saturated vapor water at 120C. Heat is transferred to the water, causing the piston to rise, and with a spring
A water-filled reactor with volume of 1 m3 is at 20 MPa, 360C and placed inside a containment room. The room is well insulated and initially evacuated. Due to a failure, the reactor ruptures
Assume the same setup as the previous problem, but the room has a volume of 100 m3. Show that the final state is two-phase and find the final pressure by trial and error.
Refrigerant-12 is contained in a piston/cylinder arrangement at 2 MPa, 150C with a mass less piston against the stops, at which point V 0.5 m3. The side above the piston is
A 10-m high open cylinder, Acyl 0.1 m2, contains 20C water above and 2 kg of 20C water below a 198.5-kg thin insulated floating piston. Assume standard g, Po. Now heat
A rigid container has two rooms filled with water, each 1 m3 separated by a wall. Room A has P = 200 kPa with a quality x = 0.80. Room B has P = 2 MPa and T = 400C. The partition wall is
A piston/cylinder arrangement of initial volume 0.025 m3 contains saturated water vapor at 180C. The steam now expands in a polytropic process with exponent n 1 to a final
Calculate the heat transfer for the process described in Problem 4.23.
Consider the piston/cylinder arrangement. A frictionless piston is free to move between two sets of stops. When the piston rests on the lower stops, the enclosed volume is 400 L. When the piston
Calculate the heat transfer for the process described in Problem 4.30. A cylinder containing 1 kg of ammonia has an externally loaded piston. Initially the ammonia is at 2 MPa, 180C and is

Showing 6200 - 6300 of 18208

First
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved