Recent content by 360modina

  1. 3

    Polymer Properties Question

    Tell me what your ideas are for this multiple choice question Compared to semiconductors, metals, and ceramics, polymers: a) have lower melting points b) tend to have lower densities c) deform plastically to a higher extent d) have lower electrical conductivity e) all of the above f)...
  2. 3

    Casting a metal (Enthalpy of Fusion Question)

    Ok, I reworked it again let me know what you link: LHS (Aluminum) (900 J/Kg-K)(0.2Kg)(700oC-660oC)+(200g)(1 mol/26.96g)(10.67 kJ/mol)+(900J/Kg-K)(0.2Kg)(660oC - Tf) RHS (Steel) (486 J/Kg-K)(3Kg)(Tf - 20oC) I took the sum of the LHS and the RHS and put them both into excel I set Tf...
  3. 3

    Casting a metal (Enthalpy of Fusion Question)

    That's actually why I posted this, I had a feeling that using the 20oC on the Aluminum side didn't make sense, so I think the left hand side should be changed to (900 J/Kg-K)(0.2Kg)(Tf, Al - 660oC). Is that correct, or am I still missing something else?
  4. 3

    Casting a metal (Enthalpy of Fusion Question)

    I want to take a liquid metal, Aluminum at 700oC and pour it into a steel mold starting at 20oC. For the purpose of the question let’s say that the heat transfer is 100% with no losses to the surroundings. Here are some numbers: Al Mass = 200 g = 0.2 Kg Ti, Al = 700oC Cp = 900 J/Kg-K...
  5. 3

    Fluid Mechanis - Pipe Flow Velocity

    I worked on the problem a bit more: I found the pipe area A= 0.785 * Diameter2 =4415.625mm2 and Q or liquid flow rate = Rho * V * Area so in order for the first velocity at the drain to be 15l/s, the Q must be at least 66.27 l/s I'm still pretty stuck though and not sure if I'm...
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    Fluid Mechanis - Pipe Flow Velocity

    Homework Statement I'm looking for a formula that has velocity at a certain point in a pipe. I only have velocity and pipe diameter. The problem goes something like: A Tube with a 0.075 meter diameter has four drains equally spaced apart with a cap at the far end. Each of the four drain...
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