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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 "slow"leak) at 155F causes a loss of 1.75 million Btu per year. Suppose your water is heated with electricity. (2.3) a. How many pounds of coal delivered to your electric utility does this leak equate to if one pound of coal contains 12,000 Btu and the boiler combustion process and water distribution system have overall efficiency of 30%? b. If a pound of coal produces 1.83 pounds of CO2 during the combustion process, how much extra carbon dioxide does the leaky faucet produce in a year?
A glass/epoxy laminate with a fiber orientation of 30 degrees is subjected to a shear stress t_xy (or tau_xy) which can be positive or negative.
What is the velocity and rate of flow of the metal into the mold? Is the flow turbulent or laminar? (Pure aluminum density ρ = 2.7 g/cm3).
In an ore minig operation, a bucket full of ore is suspended from a traveling crane which moves slowly along a stationary bridge. The bucket is to swing no more than 4m horizontally when the crane is brought to a sudden stop. Determine the maximum..
What is the acceleration of the aircraft (in m/s2)? How long does it take the aircraft to reach its take-off speed?
problem 1a plane stress element is subjected to stress componentssigmax 50 mpa sigmay -10 mpa and tauxy 40 mpa.1
Determine (a) the exit temperature, (b) the exit relative humidity of the air, (c) the exit velocity.
a gear reduction system consists of three gears a b and c. gear a starts from rest at time t0 and rotates clockwise
consider a hot-air balloon which is comprised of a basket miscellaneous ropes a burner a fuel tank and of course the
What is the mass flow rate of oxygen in lbm/s? Note that the inside diameter of a nominal 2 inch schedule 40 steel pipe is 2.067inches. Assume ideal gas principles apply.
A compressor operating adiabatically is to compress 2.83 m^3/min of air at 29.4C and 102.7 kN/m^2 to 311.6kN/m^2. Calculate the power required if the efficiency of the compressor is 75%. Also, calculate the outlet temperature.
there are two connected spur gears attached to a fixed board at points a and b. the assumptions of the system are that
a particle travels around a circular path having a radius of 50 m. if it is initially traveling with a speed of 10 m s
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