Recent content by Acnhduy

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    Graduate Use of Entropy for a Control Volume in Energy Balance

    :frown:
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    Graduate Use of Entropy for a Control Volume in Energy Balance

    Hi all, I'm having some trouble figuring out why entropy is used instead of enthalpy for an open system. From what I understand, an open system uses entropy to calculate internal energy. Since the control volume is constant (i.e. Δv = 0), wouldn't using : h = u + PΔv effectively be h = u? So...
    • Acnhduy
    • Thread
    • Balance Control Control volume Energy Energy balance Entropy Volume
    • Replies: 1
    • Forum: Thermodynamics
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    Windows vs Mac for Engineering?

    Aha, thanks for your suggestions. then if I do end up going for a pc, I would be looking at ultrabooks for their form factor and portability. But looking at some ultrabooks, their prices seem to reach around $1400. I punched in the macbook pro processor and the processor in some of the more...
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    Windows vs Mac for Engineering?

    Hello all, I am currently looking at laptops to use for school. I will be going to university this fall for general engineering. I may focus on chemical, mechanical, aerospace, or biomedical engineering. I am looking for something light and portable, with long battery life, and sufficient...
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    Projectile Motion man tosses object

    Mhm. Didnt even notice that it could be changed to secant. Thankyou
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    Projectile Motion man tosses object

    Homework Statement A man tosses object with initial velocity of 20 m/s into a room, and is 2.0 m above the ground. The room is 10.0 m above the ground. In a provided diagram, the distance from man to room horizontally is 31.8 m. I am required to solve for the angle of the object as it...
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    Projectile Motion- What angle does range equal max height?

    Thanks for the help :). After correcting that I end up with 76° :D
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    Projectile Motion- What angle does range equal max height?

    Ok I see what you mean. I'm left with 2 instead of 'a'. Mistakened as a square
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    Projectile Motion- What angle does range equal max height?

    Ohhh
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    Projectile Motion- What angle does range equal max height?

    If one side has "2a" and the other has "a", can't you divide out one of the "a" by dividing both sides by it?
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    Projectile Motion- What angle does range equal max height?

    I got sin2θ = aysin2θ from (V2sin2θ)/2ay = (V2sin2θ)/ay Cross multiply and cancel out one of the ay ay(V2sin2θ) = 2ay(V2sin2θ) ay (V2sin2θ) = 2 ay(V2sin2θ) Divide both sides by V2 V2sin2θ = ay(V2sin2θ) sin2θ = aysin2θ
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    Projectile Motion- What angle does range equal max height?

    Homework Statement At what projection angle will the range of a projectile equal its maximum height? Homework Equations Big 5 vf2= vi2 + 2ad The Attempt at a Solution So I attempted to solve this question by randomly subbing in equations into each other. If i draw out a diagram to solve...
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    Schools Which university to choose? (Canada)

    Can anyone recommend any EC's that I should be involved into strengthen my chances of acceptance? Much appreciated,
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    Schools Which university to choose? (Canada)

    Hello all, I am currently in grade 12 and looking to apply for engineering (possibly mechanical) but I am not sure which schools to choose from. I live in Ontario and would prefer a school within the province. The schools that I am interested in are UofT, Waterloo, McMaster, Queens, and...
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    Striking a match, Endothermic or Exothermic?

    Homework Statement I was wondering whether striking a match is endothermic or exothermic. Homework EquationsThe Attempt at a Solution This seems quite straight forward as striking a match releases heat, which is obviously exothermic. However, the process of igniting the match requires heat...