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What is the heat loss per unit length of pipe when heated oil at 120 C flows through the pipe and the surface of the earth is at a temperature of 0 C?
The total number of cells in device is 2*10^9. The rate of oxygen metabolism is 7.8 nmol oxygen/min/mg of cells. The cell mass is 33.7*10^ -12g/cell. How much oxygen must be delivered to the device
Measurement indicates that to cause this flow the acting on volume is 120N in the negative x direction. Determine the net rate of flow of linear momentum through the control surface.
A new prototype, proven to perform with an Isp of 1000s, but which has never been flown, is being considered. Do the mass savings achieved by the new thruster justify its use?
A LOX/LH2 rocket engine with a chamber pressure of 25 atm is optimized with an isentropic nozzle. Find the Isp and thrust produced by the rocket engine.
For a relaxed normal eye (assume a viewing distance of 25.0 cm), calculate the position of the object if the distance between the lenses is 16.3 cm?
The combustion chamber pressure and gas temperature downstream of the grain are 2.17 MPa and 2580K, respectively. Estimate, at the beginning and end of combustion the static pressure ratio p2/p1 along
Calculate the work output per unit time in the turbine if the flow rate is 30 kg/s. Neglect potential and kinetic energy changes. The turbine is insulated.
Calculate the thermal efficiency of the cycle. Neglect the power to run the pump. What is the maximum power output of the turbine if the turbine is operated reversibly?
Determine the rate of heat addition and rejection when this cycle produces 158 hp and the cycle is repeated 1530 times per minute. Use constant sp. heats at room temperature.
If the temperature changes 30 degrees celsius during a measurement of a pressure of 200 MPa, determine the error resulting from the dual sensitivity of the transducer.
Determine the mass flow rate of R-134a and water in their respective cycles, and the overall COP of this cascaded system.
If the environmental temperature is t = 40 F, what part of the above energy was available energy (i.e. energy) before it entered the gaseous system? After it entered it? Show the process on a T-S di
Calculate: the temperatures at the compressor and turbine exits, each in degree R - work of compressor Wc in (Btu/lb) - work of turbine WT in (Btu/lb) the volumetric flow rate of the air entering th
Estimate the velocity with which you would contact the ground if you jumped from an airplane at an altitude of 5000 ft and (a) air resistance is negligible.
If the mass diffusivity of medicine vapor in rubber is 0.2 x 10^-9 m^2/s, find the rate (kmol/s) at which vapor exits through the stopper.
Calculate the mass fraction of helium and the mass density, molar concentration, and molecular weight of the mixture. If the cooling system capacity is 10L, what is the mass of the coolant?
The thickness of the conductive surface is 0.005 m, and its thermal conductivity is 50 W/mK. Determine the logarithmic mean temperature, the water exit temperature t2out and the water mass flow.
Refrigerant 134a enters an adiabatic compressor as saturated vapor at 200kpa at a rate of 30 kg/min and is composed to a vapor at a pressure of 3.0mpa.
How does this subcooling change the power required to drive the compressor as compared to an ideal vapor-compression refrigeration cycle?
Determine the rate of heat addition and rejection for this Otto cycle when it produces 180 hp and the cycle is repeated 1,430 times per minute.
Determine the net work produced per unit mass of air each time this cycle is executed and the cycle's thermal efficiency.
Determine the overall plant efficiency (the ratio of net electric power output to the energy input as fuel) eta overall = % and (b) the required rate of coal supply. m coal = ton/h.
Calculate the total entropy change of the two reservoirs and determine if this heat pump satisfies the 2nd law according to the increase of entropy principle if 1.0 kj of heat is transferred from th
After a period of time, the pressure in the tank rises to 1.5 MPa. Determine the total entropy generation (kJ/K) during this process.