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A petroleum engineer estimates that the present production of 400,000 barrels of oil during this year from a group of 10 wells will decrease at the rate of 15% per year for years 2 through 10. Oil is estimated to be worth $25 per barrel. If the interest rate is 10% compounded annually, what is the equivalent present amount of the prospective future receipts from the wells?
Carbon content of steel, A steel contains 55% alpha-ferrite and 45% gamma-ferrite or austenite at 750 degrees celcius. What is the carbon content of steel?
helium initially at 327 deg. c and 100 kpa is contained in a frictionless piston-cylinder. the system is slowly cooled
develop expressions for the specific enthalpy internal energy and entropy changes hv2t-hv1tuv2t-uv1tsv2t-sv1t using
the elevator an express elevator is to carry passengers from ground level to a lobby where they can catch elevators to
what is the minimum distance d at which the brakes must be applied to avoid a collision? Treat the train as a particle and assume that the railroad tracks are rectilinear and horizontal.
an aluminum ball does not fit through a brass ring at 20oc. the diameter of the ball is 2.001 cm and the inner diameter
a thin-walled cylindrical pressure vessel of inner radius 30 mm wall thickness 3 mm and closed ends is subjected to an
when a 2000 lb vehicle is empty the static deflection of its suspen- sion system is measured as 0.8 in. what is the
a retarding force is applied to a body moving in a straight line so that during an interval of its motion its speed u
how long is required for half the ice cube to melt? State clearly all the assumptions you make in formulating your model of this problem.
a spring is stretched in 1.5 in. by a 4 lb weight. let the weight be pulled down 3 in. below the equilibrium level nd
the moisture content at the turbine exhaust is not to exceed 15%. determine the greatest allowable steam pressure at the turbine inlet and calculate the cycle efficiency.
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