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  1. I

    Centroid of an object in a fluid

    lemme rephrase that, if a object is on the incline say a circular lamina - than the centroid is the height of the object's incline divided by 2? Cheers!
  2. I

    Centroid of an object in a fluid

    Hi friends just a quick question, does the centroid of an object change if it is submerged in a fluid and is on an incline? Or indeed does the centroid of an object ever change when in a fluid or inclined? Thanks! Claudius
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    U-tube manometer fluid mechanics

    Hi friends - I'm at a lost on this particular problem which reads: a manometer consists of a U-tube, 7mm internal diameter, with vertical limbs with an enlarged upper end of 44mm diameter. the left-hand limb and the bottom of the tube are filled with water and the top of the right hand limb...
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    Simple fluids pressure question

    Hello friends I am again in need of some asistance, The Question is as follows: The pressure head in a gas main at a point 120 m above sea level is equivalent to 180 mm of water. Assuming that the densities of air and gas remain constant and equal to 1.202 kg m^-3 and 0.561 kg m^-3...
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    Engineers bending equation

    Hello friends, a question about the engineers bending equation, M/I = E/R = (sigma)/y so take for example a beam with a rectangular cross section with depth 'b'. Will y then equal b/2 ? As y is measured from the neutral axis? Thank you in advance for your time, Claudius
  6. I

    Slow test taker?

    Who cares what other people think? You say you're doing well. I don't see an issue here. Different strokes for different folks.
  7. I

    How much would you pay to see Pacquiao vs. Mayweather?

    This would be a great fight. Pacman's offensive ability v Floyd's defensive prowess. If it does happen though the event would be atleast a year off :(.
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    How much would you pay to see Pacquiao vs. Mayweather?

    $50 - That is the market price, but if we are talking about my limit I would proabbly go $100. Is this fight happening soon is it? oh btw I prefer to watch from comfort of my home - you'd have to pay me to go to the stadium.
  9. I

    Castigliano's Theorem on Curved Beams

    Hi thanks for the reply, is that (bh)^3/12 or b (h^3/12)
  10. I

    Castigliano's Theorem on Curved Beams

    Can you solve for I any other way - other than using that equation without vertical deflection and or horizontal deflection?
  11. I

    Second moment of area: I

    Hello my friends, so I am once again confused :frown: Is the second moment of area a universal property of a beam i.e the beams cross section? So what i mean to say is - if i have a beam and it is curved with a rectangular cross section, and take this same beam and ensure it to be now straight...
  12. I

    Castigliano's Theorem on Curved Beams

    If i wanted to calculate I in this problem would it simply be as follows: I = (pi*P*R^(3)) / (2E) ? and thus substituting values in if we take E = 69 GPa R = 150 mm P = 0.1 N we get I = 1.28 *10^(-14)m^(4) The answer i get in my textbook however reads - 1.63*10^(-28)m^4 Am i...
  13. I

    Question on notation

    Note - I have already solved this question just want to know how to express that above statement in math.
  14. I

    Question on notation

    Hello friends, I have this problem it reads: A random variable X is defined to be the larger of the two values when two dice are thrown, or the value if the values are the same. Find the probability distribution for X. So I don't know how to state "X is defined to be the larger of the...
  15. I

    Weird Problem and Answer

    Wow so neat!:cool: Handwriting that is. And the colours!
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    Hello friends,I have this problem I'm having difficulty

    Hello friends, I have this problem I'm having difficulty with, it reads - simplify the following expression ( ( x + 2 ) / (x^(2) - 2x) ) - ( (x) / (x^(2) - 4) ) it wants me to simplify it into ( 4(x + 1) ) / ( x(x - 2) ( x + 2) ) I can't get it to...
  17. I

    Simple logs question

    Ahhh - off course! Thank you so much for clearing that up!
  18. I

    Simple logs question

    Ok i see what you did there King - however why can I not take Ln(8) to the other side and combine using log laws? As Mute has pointed out
  19. I

    Simple logs question

    hmmm no...
  20. I

    Simple logs question

    ok so my working is like this Ln( ((x+3) (x-4)) / 8 ) = 0 simple quadractic - solve for x i get x=4, and x =-3
  21. I

    Simple logs question

    Hello friends, so i have this problem it reads: how many solutions does the following equation have Log_a(x+3) + Log_a(x-4) = Log_a(8) ok so first i put all the logs on one side of the equation and solve for x after using log laws, and i get x = 4 and x = -3, however plugging...
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    Confusing question

    Hiya Hallsofivy thanks for your reply - lazy mistake on my part :yuck:
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    Confusing question

    Hello friends, I have this question which stumps me because i have no idea what its actually asking for :S - it reads: calculate the value of the first derivative of f(x) = x^(2) -3x - 1/x at x = 2. In which interval does it lie? (a) -x <= x < 0 (b) 0 <= x < 4 (c)...
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    Shape of graph polynomial to the fifth degree

    Ah yes :D, thank you! :approve:
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    Shape of graph polynomial to the fifth degree

    Hello my friends, I have this problem and would appreciate someones help: Determine all intervals where the following function is increasing or decreasing. F(x) = -x^(5)+(5/2)x^(4)+(40/3)x^(3)+5 Solution To determine if the function is increasing or decreasing we will need the...
  26. I

    Simple bending beams question

    Hello friends, so i have this problem: A beam under test has a measured radius of curvature of 300 m. The bending moment applied to it is 8 Nm. The second moment of area is 8000 mm4. Calculate the modulus of elasticity for the material. ok so using the engineers bending equation i have...
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