The spring-loaded piston–cylinder device shown in the figure is filled with 0.55 kg of water vapor that is initially at 4 MPa and 400°C. Initially, the spring exerts no force against the piston. The spring constant in the spring force relation F = kx is k = 0.9 kN/cm and the piston diameter is D = 20 cm. The water now undergoes a process until its volume is one-half of the original volume. Calculate the final temperature and the specific enthalpy of the water. Use data from the steam tables
In: Mechanical Engineering
A piston–cylinder device initially contains 2 kg water in 1 m3 at 500 kPa. The system then cools down and the volume drops to half and pressure of 300 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 500 kPa is required to move it. (a) Show the process on a P-v, T-v and P-T diagrams with respect to saturation lines and determine, (b) the final temperature, (c) the work done during this process, and (d) the total heat transfer. full step plz
In: Mechanical Engineering
Using MATLAB, plot the following curves for the crank angle range of 0-360:
a. For an engine that has R=3.5 and L=110 mm, plot the piston speed Sp at engine speeds of 500 RPM, 2000 RPM, and 5000 RPM on the same plot.
b. For an engine that has L=110mm and running at an engine speed of 5000 RPM, plot the piston speed Sp at R = 3, 4, and 5 on the same plot.
c. For each of the cases above, determine the crank angle at which the piston speed is maximum.
In: Mechanical Engineering
In the figure, the top tank, which is open to the atmosphere, contains water and the bottom tank contains oil covered by a piston. The tank on the right has a freely movable partition that keeps the oil and water separate. The partition is a vertical distance 0.10 m below the open surface of the water. If the piston in the bottom tank is 0.50 m below the open surface of the water and has a surface area of 8.3 x 10-3 m2, what must the mass of the piston be to keep the system in mechanical equilibrium. For simplicity, ignore the mass of the partition.
In: Physics
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Determine the entropy change of the systems given below and their surroundings. lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
Discuss if the 2nd law is violated or not.
(a) A gas in a rigid tank is heated in a reversible process.
(b) An ideal gas with constant specific heats in a piston-cylinder device is cooled down in a reversible isobaric process.
(c) A gas in a piston-cylinder device is compressed in a reversible adiabatic process.
(d) A saturated liquid-vapor mixture in a piston-cylinder device releases heat in an irreversible isothermal process till the working fluid is a saturated liquid.
In: Other
The pricing schedule for labor on a service call by an elevator repair company is $150 plus $50 per hour on site.
A. Write down the linear equation that relates the labor cost y to the number of hours x that the repairman is on site.
B. Calculate the labor cost for a service call that lasts 2.5 hours
****YOU MUST SHOW ALL OF YOUR WORK TO DETERMINE HOW YOU ARRIVED AT THE SOLUTION IN ORDER TO RECEIVE CREDIT****
In: Statistics and Probability
The pricing schedule for labor on a service call by an elevator repair company is $150 plus $50 per hour on site.
A. Write down the linear equation that relates the labor cost y to the number of hours x that the repairman is on site.
B. Calculate the labor cost for a service call that lasts 2.5 hours
****YOU MUST SHOW ALL OF YOUR WORK TO DETERMINE HOW YOU ARRIVED AT THE SOLUTION IN ORDER TO RECEIVE CREDIT****
In: Statistics and Probability
Two players compete in an auction to win an object. Players’ valuation for the object are different: player i’s value for winning the object is vi , for i = 1, 2, with v1 > v2 > 0. These values are publicly known. The rules of the auction are the following: (a) Each player submits a bid bi ∈ [0,∞) to the auctioneer. (b) The player who makes the highest bid wins the object and pays the auctioneer bi . The player who does not win the object, does not pay anything. (c) If the two players submit the same bid, then the auctioneer gives the object to player 1. Find all the Nash equilibria in pure strategies of this game
In: Economics
a) You have installed the DNS server role on a computer running Windows Server 2016 and in the process of configuring forward/reverse lookups. Explain the difference between “ping www.google.com” and “ping the IP address of Google server at 172.217.167.68”. You may want to try both and observe any differences. Your answer should include your explanation, as well as screenshots.
b) Network administrators warn against configuring a file server to use DHCP. Explain what would happen if a file server was configured to use DHCP and, due to a power outage, the file server and DHCP server rebooted at the same time? Justify your answer.
In: Computer Science
The number of cyclins of each type (G1/S cyclins, S cyclins, M cyclins) vary during different stages of the cell cycle?
True or False?
What is the function of SCF?
A. removes a H+ from a molecule
B. adds a phosphate to a molecule
C. add ubiquitin to a molecule
D. removes a phosphate from a molecule
Select all of the following which can inactivate a cyclin dependent kinase (cdk)
A. remove an inhibitory protein
B. remove the cyclin from the cdk
C. remove an inhibitory phosphate
D. add an inhibitory phosphate
E. add an inhibitory protein
What stage of mitosis does APC/cdc20 stimulate? Use one word: for example: prophase
In: Biology