Engineering, 26.11.2019 00:31, thedocgalloway
In 1945, the united states tested the world’s first atomic bomb in what was called the trinity test. following the test, images were published showing the evolution of the blast. a few years later, a british scientist, by the name of g. i. taylor, used dimensional analysis to predict the amount of energy released by the trinity explosion, which was still classified information at the time. he did so, just by analyzing the images alone. he assumed the blast radius, r, depended only on the evolution time, t, the energy released, e, and the density of air, rho. using the buckingham-pi theorem, find the dimensionless group, π1 = k, where k is a constant. assuming k = 1, find the energy released, in tons of tnt, if the radius of the blast wave at t = 0.025s is r = 140m. take the density of air to be rho = 1.2kg/m3. note, there are 4.184 × 109j per ton of tnt equivalent.
Answers: 1
Engineering, 04.07.2019 18:10, settasav9641
Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.
Answers: 3
Engineering, 04.07.2019 18:10, 0436500
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Engineering, 06.07.2019 02:30, sandy2597
Precipitation hardening can be achieved in many light alloys by a three-step heat treatment. what is carried out and what is the purpose at each step? why is such a treatment necessary based on the nucleation and growth theory of phase transformation. compare this treatment with tempering martensite for carbon steels (similarities and differences).
Answers: 1
In 1945, the united states tested the world’s first atomic bomb in what was called the trinity test....
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