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A house that was heated by electric resistance heaters consumed 1200 kWh of electric energy in a winter month. If this house were heated instead by a heat pump that has an average COP of 2.4, determine how much money the home owner would have saved that month. Assume a price of 8.5¢/kWh for electricity.
consider a roof of a house of thickness l 20 cm thermal conductivity k 1 wm k and emittance of the external surface
A satellite has been placed in a circular, sun-synchronous orbit at an altitude of 1300.0 km. The satellite has a mass of 5,000.0 kg. What is the K.E. of the satellite?
determine the rate of diffusion of cu in al at 300k using d do exp -edrt where do 0.15 cm2sec and ed 125 kjmole.
a gas is contained in a vertical frictionless pixton-cylinder. the piston m 10 kg a- 7.5 x 10-3 m2 is attached to a
determine the specific volume of superheated water vapor at 15mpa and 350oc using a the ideal gas equation b the
a certain body is weighed at an elevation of 30000 ft where g32.08 ftsec2 by a spring balance that was calibrated at
The hydrogen spectrum has a red line at 656 nm and a blue line at 434 nm. What is the first order angular separations between these two spectral lines obtained with a diffraction grating that has 4500 lines per centimeter?
a thin-walled cylindrical pressure vessel of 250 mm internal diameter and 5 mm thickness is subjected to an internal
water pressure of 10 kpa is pumped to a pressure of 4mpa. what is minimum energy requirement of the pump in kjkg.
a 0.4 w cylindrical electronic component with a diameter of 0.3 cm and length 1.8 cm is mounted horizontally on a
Wheel of radius r is driven by an arm OA. It is driving (without slip) wheel of a radius r2 which is fixed to a drum of radius r1. Load G is attached to the rope which winds on the drum. Calculate the speed of load G if the arm OA moves at n rev/m..
a single cycle of a ramp function of voltage versus time has the form vt 100t from -0.01 to 0.01 s. using direct
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