Positive work is defined by work done the system
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- The heat loss of a human body during stationary sitting is 400 kJ/H. A population of 800 if the ventilation system of the cinema hall is broken, after 15 minutes from the walls of the Hall considering that the heat loss is; a.) If the air in the hall is treated as a system, can you find an increase in the internal energy of the system? b.) If the air and people in the hall are treated as a system, the change in the internal energy of the systemdid you find it?Q3/ A worker in a company manufactures 50 gears in 10 days. It is found that the time for production each gear takes 2 hours and the setting time for the job is 1 hour. Consider the following; these 10 days consists the time of setting the machines. Cakulate (1) the standard time required to produce these 50 gears (2) efficiency of the worker.A closed system loses energy by heat transfer at the rate of 10kJ/s. Write the energy balance for this problem if the system operates at steady state
- the force acting on a spring at any displacement is undeformed length is equivalent to the product of the amount of displacement (s) and k. what is k?A system is being designed to remove heat from a server rack in a data center. The figure below provides a schematic of this system. A pump circulates water through a heat sink in the rack to remove 5000 W of heat. To keep the electronics below the temperature at which damage may occur, the water leaving the server rack will be limited to 80 °C. That temperature will result in the most optimal system, so you can assume that it is the temperature of the water leaving the server rack. This water is then circulated to a heat exchanger that can be modeled as a counter flow model with a stream of air to remove the heat. Air with an inlet temperature of 20 C at a mass flow rate of 0.1 kg/s is blown through this heat exchanger. Your task is to determine the size of the air-to-water heat exchanger (i.e., its area) and the mass flow rate of water to minimize the life cycle cost of the system. The cost, which is dominated by the first cost of the heat exchanger and the energy to run the pump,…thermodynamics The heat loss of a human body during sitting still is 400 kJ / h. If the ventilation system of a movie theater with 800 people is broken, after 15 minutes there is no heat loss from the hall walls;a. If the air in the hall is taken as a system, find the increase in the internal energy of the system.b. If the air and people in the room are considered as a system, find the change in the internal energy of the system?
- A baker has 150, 90, and 150 units of ingredients A, B, C, respectively. A loaf of bread requires 1, 1, and 2 units of A, B, C, respectively; a cake requires 5, 2, and 1 units of A, B, C, respectively. Find the number of each that should be baked in order to maximize gross income if: A loaf of bread sells for $1.80, and a cake for $3.20. loaves cakes maximum gross income2.0 lb of water inside a piston-cy inder assembly undergoes the following two processes in series Process 1-2: Contant pressure cooling from a saturated vapor at p1 = 170 psi until x2 = 80%. Process 2-3: Constant volume heating to a saturated vapor. There are no changes in kinetic or potential energy. d)Find the heat transfer for process 1-2 in Btu. e) Find the work for process 2-3 in Btu. f) Find the heat transfer for process 2-3 in Btu.Please don't copy wrong solution ,Strictly use paper sheet to solve. Mechanical engineering: Thermodynamics. Q1:- A vertical hydraulic cylinder has a 125-mm diameter piston with hydraulic fluid inside the cylinder and an ambient pressure of 1 bar. Assuming standard gravity, find the piston mass that will create a pressure inside of 1500 kPa.
- Q.3: The properties of a closed system change following the relation between pressure and volume as PV- 3, where Pis in bar, V is in m'. If the pressure increase from 1.5 bar to 7.5 bar. a. Drive an expression to calculate the work done during process. b. Determine the work for the process, in kJ.3. A trash compactor pushes down with a force of 500 N on a 3 cm2 input piston, causing a force of 30,000 N to crush the trash. What is the area of the output piston that crushes the trash?2.0 lb of water inside a piston-cy inder assembly undergoes the following two processes in series Process 1-2: Contant pressure cooling from a saturated vapor at p1 = 170 psi until x2 = 80%. Process 2-3: Constant volume heating to a saturated vapor. There are no changes in kinetic or potential energy. c) Find the work for process 1-2 in Btu. d) Find the heat transfer for process 1-2 in Btu.