Engineering, 30.08.2021 14:00 tyneshiajones124
1, Cho dầm đơn giản tiết diện chữ nhật với kích thước bxh = 22x60cm, bêtông cấp độ bền B20, hệ số điều kiện làm
việc của bêtông b2 = 1, nhóm cốt thép CB300-V, mômen uốn tính toán M=210 kNm.
a, Tính cốt thép As
b, Vẽ mặt cắt bố trí đầy đủ các cốt thép chịu lực và cấu tạo
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Engineering, 03.07.2019 14:10
Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.
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Engineering, 04.07.2019 18:20
Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
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Engineering, 06.07.2019 02:30
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
Engineering, 06.07.2019 04:10
Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method
Answers: 1
1, Cho dầm đơn giản tiết diện chữ nhật với kích thước bxh = 22x60cm, bêtông cấp độ bền B20, hệ số đi...
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