# Recent content by Hyperfluxe

1. ### Find equivalent resistance in this circuit

I'm still confused though, is my method of finding Iab correct?
2. ### 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...
3. ### 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?
4. ### 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. ### 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...
6. ### Need help with elastic/ballon vehicle project

No other requirements and yes it's a land zone, on a table.
7. ### 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...
8. ### 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. ### Static friction problem for person to walk up plank

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

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

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