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The wearing parts of a coal mining machine are made of hardened tool steel, but are rarely, if ever, lubricated. The left and right wear plates for a typical tracked vehicle measure 48" long by 6" wide, and each tests at 360 HB. The vehicle weighs 10 tons. How far can it travel underground before each wear plate is reduced in thickness by 1/8"?
a 1 m3 rocket-propellant chamber is tilled with combustion gases at 3000 k and 7 mpa at the instant combustion ceases.
air enters the compressor of an ideal closed air-standard brayton cycle at 100kpa with a volumetric flow rate of 5m3s.
a 4 ft concrete post is reinforced with four steel bars each with a 34 diameter. knowing that es 29 x 106 psi and ec
a reversible power cycle operates between a reservoir at temperature th and a lower temperature reservoir at 290 k. at
a jet is coming out of a dive and a sensor in the pilots seat measures a force 800lbs for a pilot whose weight is
a permanent magnet dc motor is coupled to a load through a gearbox. if the polar moments of inertia of the rotor and
The equilibrium number of vacancies for an element is 3.100 x 10-6 at 600°C and 5.880 x 10-6 at 1300°C. What is the energy of vacancy formation in this element?
consider a spark ignition combustion engine with two possible configurartion for turbocharging. configuration a is
consider air in a piston-cylinder assembly. initially the air is at p1 2bars and t1 600k . the air is compressed
A tensile specimen of cartridge brass sheet has a cross section of 0.320 in. × 0.120 in. and a gage length of 2.00 in. Calculate the engineering strain that occurred during a test if the distance between gage markings is 2.35 in. after the test.
a helium gas in a pistoncylinder is compressed from 100kpa 300 k to 200kpa in a polytropic process with n1.5. find the
a compressor takes in air at 100 kpa and 300 k and discharges it at 0.25 kgs at 1.2 mpa and 450 k. unfortunately the
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