Engineering, 06.05.2020 07:17, cinderalla16dh
With the advent of photosynthesis, the amount of oxygen in the atmosphere has varied over the eons up to 35 % by volume, theoretically leading to larger plants and animals. The current concentration is 21 % oxygen, 78 % nitrogen, and 1 % other gases such as argon and carbon dioxide Assuming an atmosphere of 32 % oxygen, to the nearest whole number (no decimal) what would be the ideal volume of water (in mL) initially placed in a 50 mL graduated cylinder (assuming the graduation goes up to the lip of the container) for optimal combustion (biggest explosion) if we collected pure hydrogen by displacement as in this experiment? Make sure to account for the stoichiometry of the combustion, that all gases involved are diatomic, and that equal moles of different ideal gases occupy equal volumes at the same temperature.
Answers: 3
Engineering, 03.07.2019 15:10, EmilySerna
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
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, xboxdude06
Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.
Answers: 1
Engineering, 04.07.2019 18:20, RiverH246
Air flows over a heated plate Γ t a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point. the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
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