Engineering, 15.10.2019 19:20, AutumnJoy12
One mole of tungsten (6 1023 atoms) has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter, so the center-to-center distance between atoms is 2.51 10-10 m. you have a long thin bar of tungsten, 2.9 m long, with a square cross section, 0.12 cm on a side. you hang the rod vertically and attach a 265 kg mass to the bottom, and you observe that the bar becomes 1.45 cm longer. from these measurements, it is possible to determine the stiffness of one interatomic bond in tungsten. 1) what is the spring stiffness of the entire wire, considered as a single macroscopic (large scale), very stiff spring? ks = n/m 2) how many side-by-side atomic chains (long springs) are there in this wire? this is the same as the number of atoms on the bottom surface of the tungsten wire. note that the cross-sectional area of one tungsten atom is (2.51 10-10)2 m2. number of side-by-side long chains of atoms = 3) how many interatomic bonds are there in one atomic chain running the length of the wire? number of bonds in total length = 4) what is the stiffness of a single interatomic "sprin
Answers: 1
Engineering, 03.07.2019 14:10, BardiFan
Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.
Answers: 3
Engineering, 04.07.2019 18:10, niyawilliams23
Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10
Answers: 1
One mole of tungsten (6 1023 atoms) has a mass of 184 grams, and its density is 19.3 grams per cubic...
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