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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.
one structure is made from a si3n4 plate which has a plane strain fracture toughness of 3.6 and is alternatively loaded
vinefera grapes are picked when the outside temperature is 35c and then cooled to 5c within a 12-h period. for each
a rocket launched vertically upward is being monitored by a radar located at a distance 1.2 km from the launch pad. the
a steel plate which is 1.5 m by 1.5 m and 30 mm thick is lifted by four cables attached to its corners that meet at a
water with a quality of 70 is contained in a cylinder with a weight on a piston that maintains a water pressure of 500
a room with 42 kg of dry air has 1 kg of water vapor. if the enthalpy of the water vapor at 31 deg celcius is 3406 kjkg
consider the ocean thermal energy conversion system given in the lecture notes. also take into consideration that
an axially loaded brass strut hinged at both ends is 1m long and is of a square cross-section of sides 20mm. what
consider an air-standard brayton cycle. what is the efficiency of the brayton cycle if the pressure ratio is 20 and the
A current of 10 A rms flows when a single-phase circuit is placed across a 220-V rms source. The current lags the voltage by 60?. Find the power dissipated by the circuit and the power factor.
image text transcribed for accessibility a black thermocouple is used to measure the internal temperature of a furnace
Explain how you would expect the strength and ductility of a crystalline material to change as the ASTM Grain size number change from 14 to 3.
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