Recent content by Hyperfluxe

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    Find equivalent resistance in this circuit

    I'm still confused though, is my method of finding Iab correct?
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    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...
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    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.
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    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.
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    Static friction problem for person to walk up plank

    Yeah my bad, the quality is horrendous. Here's a way better one:
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    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?
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    Static friction problem for person to walk up plank

    Homework Statement Homework Equations See my work. The Attempt at a Solution
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    Tension/Compression in Joints

    Thanks so much guys, I appreciate it =)
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    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...
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    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...
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    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!
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