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Name three countries with the largest percentage of the world coal proved reserve. Using the latest value of US coal reserve, and electricity consumption of US in 2011, how long does this coal reserve of US will last if all coal is used to generate electricity? Assume the efficiency of converting coal to electricity is 35%.
a machine of mass 20 kg is acted upon by a harmonic force having a maximum value of 25 n at a frequency of 120
a bar of aluminum is subjected to a tensile load of 15000 lbs. if the bar is 0.35 inches in diameter and 20 inches long
methane oxygen and nitrogen flow into an insulated tank. the methane flow is 2 kgs at the 320k. the oxygen flow is 3
water at 15 degrees celcius flows through a nozzle that contracts from a diameter of 20cm to 2cm. the pressure at
consider the reversible adiabatic flow of stream through a nozzle. steam enters the nozzle at 1 mpa and 300degc with a
a large storage tank contains 500000 l of milk. milk enters the tank through a 0.05 m diameter pipe at a velocity of 3
measurements of the diameters of a random sample of 200 ball bearings made by a certain machine during one week showed
a nitrogen line 300 k and 0.5 mpa shown in the figure is connected to a turbine that exhausts to a closed initially
a closed system consists of an ideal gas with constant specific heats that remain constant. the gas undergoes a proces
using the kelvin - planck statement of the second law of thermodynamics demostrate the following corollariesa the
What load P allow can be supported at the midpoint of the bar if the yield stress in the steel wires is 220 MPa and in the aluminium wire is 80 MPa? A saftey factor of n = 2 is needed.
in a certain processing plant 10000 kgh steam is changed from 1 mpa 400degc to 0.2 mpa 200degc in a steady-flow device
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