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  1. H

    Find equivalent resistance in this circuit

    I'm still confused though, is my method of finding Iab correct?
  2. H

    Find equivalent resistance in this circuit

    Homework Statement http://session.masteringengineering.com/problemAsset/1515645/4/Steif.ch02.p28.jpg Find the equivalent resistance between node A and B, knowing that Rab = Vab/Iab Homework Equations KCL and KVL, I know. The Attempt at a Solution There is nothing in series or...
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    Optics - Angular Magnification

    Using the object-image relation formula (1/s + 1/s' = 1/f), the image from the first lens becomes the object of the second lens. I tried doing that, but I'm not sure which lens acts as the object, and would the first object distance be 17cm?
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    Optics - Angular Magnification

    I used 25cm because that is the normal near point, and it says it in the problem statement. The total magnification = angular magnification * lateral magnification, where lateral magnification = s1'/s1 Since I know that the total magnification is 113.333 (as calculated in my original post), I...
  5. H

    Optics - Angular Magnification

    Homework Statement The eyepiece of a compound microscope has a focal length of 2.50 cm and the objective has a focal length of 1.5 cm. The two lenses are separated by 17 cm. The microscope is used by a person with normal eyes (near point at 25 cm). What is the angular magnification of the...
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    Need help with elastic/ballon vehicle project

    No other requirements and yes it's a land zone, on a table.
  7. H

    Need help with elastic/ballon vehicle project

    I need to design a a vehicle using only elastics and/or balloons as a source of energy, and the cost of the overall material must not exceed $20. Now, I am not asking you guys to do the work for me, but I need ideas because there is a catch. The vehicle must do a hairpin turn at a certain point...
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    Static friction problem for person to walk up plank

    Wow that was such a silly mistake haha. Thanks for pointing it out! I got 1.00m as the answer.
  9. H

    Static friction problem for person to walk up plank

    Yeah my bad, the quality is horrendous. Here's a way better one:
  10. H

    Static friction problem for person to walk up plank

    Shouldn't the weights be multiplied by cos(40) because they are vertically downwards, so the moment arm would be the horizontal distance?
  11. H

    Static friction problem for person to walk up plank

    Homework Statement Homework Equations See my work. The Attempt at a Solution
  12. H

    Tension/Compression in Joints

    Thanks so much guys, I appreciate it =)
  13. H

    Tension/Compression in Joints

    Thank you :) A lot of people in my class seem to be getting 23.7N for the axial force in AE, and they found that the joint is under tension. I don't see anything wrong with my solution so I'm keeping it. I'm confused about one thing: how exactly do you know if a member is under compression...
  14. H

    Tension/Compression in Joints

    Statics - Forces in a Truss Homework Statement http://i.imgur.com/NbZlc.png Homework Equations Equations of equilibrium (sum of the forces in all directions = 0, sum of the moments about an point = 0) The Attempt at a Solution My attempt: http://i.imgur.com/qlLCY.jpg Hopefully...
  15. H

    Torque/moment of beam in equilibrium

    Thank you very much! Turns out I didn't have enough knowledge on moments on Friday, so I wasted 2 hours trying to solve that question. It feels really satisfying right now though!
  16. H

    Torque/moment of beam in equilibrium

    Ok, what I did instead is making a sum of the moments equation about point A. So, from my FBD, I get 3 equations. F1 is the force between the left contact point and the wall, and F2 is the force from the edge contact point. W is the weight (assuming it acts down at the center of the bar), I get...
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    Torque/moment of beam in equilibrium

    Homework Statement http://i.imgur.com/5plXa.png Homework Equations ƩFx = 0, ƩFy = 0, ƩM = 0 The Attempt at a Solution I realize that this is an equilibrium problem and that the sum of the forces in the x and y directions is 0, and the sum of the moments is 0. I draw two free body...
  18. H

    Electrical vs. mechanical (engineering)

    Hello, I just recently transferred to U of Calgary and I have one week left to choose which engineering discipline I want to go into. I've narrowed it down to EE and ME. I think I like both disciplines equally and I have a major interest in both. What do you guys think is the 'better' degree...
  19. H

    2 hanging masses with springs, find spring constant

    Thank you for you time and help =)
  20. H

    2 hanging masses with springs, find spring constant

    Oh I see. From drawing seperate FBD's, I get the equations: kxa = kxb + mag (block A) kxb = mbg (block B) Substitute kxb back into the first equation to get kxa = (ma + mb)g, where xa = 300mm - 250mm, thus k = 1.962kN/m. Is this correct? Thank you.
  21. H

    2 hanging masses with springs, find spring constant

    Homework Statement http://i.imgur.com/0gexJ.png Homework Equations F=kx (Hooke's Law), ƩFy=0 The Attempt at a Solution I drew a free-body diagram for each block. For block A, I get the equilibrium equation: Fa = (10kg)(9.81ms^-2) = 98.1N = kx_a x_a = 300mm-250mm = 50mm k = 1.962kN/m For...
  22. H

    AC circuit with two components given phase angle

    Homework Statement A circuit contains two elements, but it is not known if they are L, R or C. The current in this circuit when connected to a 1.20×101 V, 60.0 Hz source is 4.70 A and lags the voltage by 4.20×101 degrees. a) What are the two elements? (Answer A,B or C) CL CR LR Homework...
  23. H

    Carbon dioxide from an antacid tablet

    There would be a LOWER concentration of CaCO3 then! So the answer to the question would be NO, because if anything it would be a lower a concentration? Of course I have to back that up with reasoning + stoich. To answer your question, there would be 1g of CaCO3. What do you mean by...
  24. H

    Carbon dioxide from an antacid tablet

    Homework Statement Let’s say the % concentrations of CaCO3 (table 5) you obtain from trial #1 and #2 are consistent, while the concentration obtained from trial #3 is significantly higher. Demonstrate, how and where, a wet flask could be involved to explain such a result. Explain in great...
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    Mechanical engineering if you hated Physics I (Mechanics)

    Hi, I was wondering that if one disliked Physics I (Mechanics & Waves), would they hate mechanical engineering as well? How closely related are the two? Here is the curriculum for my Physics I course: "The basic laws and principles of Newtonian mechanics; oscillations and waves". So kinematics...
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    Master's in electrical engineering after bachelor's in mechanical engineering?

    Hello, Is it possible to get into master's program for electrical engineering (in North America) after completing a bachelor's degree in mechanical engineering? The reason being is that I plan to pursue a bachelor's in mechanical engineering because that's the 'safe' degree for where I live...
  27. H

    Post your spring schedule!

    Multivariable Calculus Electromagnetism & Optics General Chemistry II Intro to Computer Programming Written and Oral Communications for Engineering
  28. H

    Engineering Science at U of T

    I see, you've been fed the U of T EngSci propaganda. What you said is really not true at all. It may be (one of) the most prestigious degrees in Canada because of the difficulty, but EngSci grads almost always compete for the same jobs are engineers who went into regular programs. Do a quick job...
  29. H

    The physical pendulum - distance, period, and angular frequency

    Anyone? For part c) I realize that we have to use the equation of frequency (1/T), then find the derivative and set it equal to zero to find the distance which gives the maximum frequency, but what is the moment of inertia (Icm) in this case?
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