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An electric water heater having a 200-L capacity heats water from 23 to 55°C. Heat transfer from the outside of the water heater is negligible, and the states of the electrical heating element and the tank holding the water do not change significantly. Perform a full exergy accounting, in kJ, of the electricity supplied to the water heater. Model the water as incompressible with a specific heat c 5 4.18 kJ/kg ? K. Let T0 5 23°C.
a hot air balloon approx as a sphere of diameter 50ft is to lift a basket load of 600lbf. to what temperature must the
a hot water leak in one of the facets of your apartment can be very wasteful. a continuous leak of one quart per hour a
Determine the minimum value of R and the corresponding value of x - Determine the equilibrium configuration angles a, /3, and y, as well as the tension in each cable segment
a shaft which rotates at a constant speed of 160 r.p.m. is connected by belting to a parallel shaft 720 mm apart which
a rigid tank contains 2kg of saturated liquid and saturated vapor mixture 500kpa. what quality x do you need if you
A linear isotropic material has the shear modulus of elasticity G of 11.5*10^6 psi and the Poisson's constant v of 0.3.
two circus performers pyramus and thisbe. pyramus will swing back and forth with amplitude 8 on a trapeze bar that
Illustrate different techniques by which this could be done. Explain why a ceramic coating and discuss the advantages of the three techniques. You may use appropriate examples and references - Estimate the elastic strain in copper at the yield stre..
consider the 2d inviscid flow over a body of some known shape. write down general expressions for the total aerodynamic
a system receives 10 kj of energy to do something. the system is adiabatic and its super efficient. how much work
consider two very large parallel plates. the bottom plate is warmer than the top plate which is held at a constant
The exposed surfaces of the aluminum plate are painted with a very thin coating of high emissivity (s = 0.95) paint. Determine the electrical power that must be supplied to the heater to sustain the plate at a temperature of Ts = 35°C. How much of..
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