How do you decide the pivot point when calculating torque?
204 m is LONGER THAN THE LOG, so you should immediately discard that answer. Be careful about blindly applying formulas; make sure the resulting answer makes sense inside the physical system.Here’s how you can envision the problem:The downward force of a 75 kg person on earth will be 75 kg * 9.8 [math]m/s^2 [/math]= 735 NThe log itself has a weight of 420 kg * 9.8 [math]m/s^2[/math] = 4116 NPresume the load is evenly held at both ends, 2058 N each (4116/ 2)The near end of the crossing has no listed limit to the force it can bear. However, the limit force at the other edge is 2650 N, meaning it can stand an extra 592 N (2650 minus 2058) only before collapsing.If Professor Jones stands on the weakened end, it will immediately collapse under his exerted force of 735 N.So, can he get close enough to the end to jump?If he stands in the middle of the log (18m), he will exert half his weight (735 /2 = 367.5 N) at each end of the log. So in the middle of the log, all is cool. So, what percentage of 735 N will equal the critical crossover point of 592 N?735 / x = 592x = 735/592 = 1.24,1/1.24 = 0.805So when he gets 80.5% of the way across the log, it will collapse. 80.5% of 36 m is about 29 m.In conclusion, if he can jump 7 m, he should cross the log.Note that the all time long jump record is 8.95 m. A 7 m jump is possible for a well trained athlete, but ill advised for an aging archaeologist on an unstable surface, barring the fortuitous appearance of a hanging jungle vine.
What is the best way to make a career pivot from front-end development to UX design?
Having done this myself, I have a few possible suggestions.The first thing you have to do is educate yourself. You have to be able to speak the language of UX and understand the psychology behind human behavior. There are a lot of free and low-cost options - attend some local meet-ups (UXPA and IxDA are good starting points), read books about design/usability, listen to podcasts, and find online communities where designers congregate (locally, if possible).At the same time, start implementing some of the methods from the UX process into your development work. I started by creating paper prototypes and testing them with my colleagues before implementing new functionality. User research and usability testing are great “first” activities to start doing in your current role.Also start working on evangelizing UX within your immediate team/organization. If you already have some designers in your company, reach out to them and start asking for advice and showing them what you’re working on. If not, find other like-minded individuals and form a book club or study group where you discuss your work and what you are learning about UX. The more community support you have behind you, the better off you will be.The easiest path to transition into UX is to do it within your current company and by evangelizing UX and making yourself known as the UX expert, you will have an easier time of convincing management to let you work on UX full-time. If this is not possible, you want to be able to show how you’ve practiced UX design in your previous role. That’s where you have to look for opportunities to spend time on testing and design before building out features. Any small wins will help you out big-time once you begin interviewing for UX roles.I hope this helps! Good luck with your transition!
Where do I set the pivot point in torque problems?
I'm somewhat confused about torque in mechanics. I thought I had it, but apparently not! In equilibrium problems, we want the sum of the torques to be zero, and I learned that the pivot point/axis of rotation can be any point, usually chosen for convenience. However, I'm not sure why I get different answers based on the pivot points I choose! I did one problem that concerned a beam that had a 120 N force on it 3m away from the pivot point. The end of the beam is 4m away from the pivot point and also has a force exerted on it. If the beam has negligible mass, what is the magnitude of the other forces so that the beam is at rest? This is so confusing now that I think of it. It would make sense to have (120)(3) = x(4) and have x = 90 N. But if it's at rest, can't the pivot point be ANYWHERE? I'm confused!
How can I move the position of a pivot table in an Excel spreadsheet?
I am old-fashioned, I just Ctrl-x, Ctrl-v. However, there are a couple of “buts” and “ifs”.In Excel 2013 (which I don’t use, mostly; I’m happily basking in Excel 2007), the default settings for a pivot table mean you need to use the mouse to highlight the pivot table, from corner to corner, then Ctrl-x, Ctrl-v (or Ctrl-c, even). This highlighted pivot table shows my cursor ending at the lower right corner.2. My preference in any version of Excel is to turn on Classic mode. With cursor inside the pivot table: Analyze/Options/Display tab/then turn on Classic Pivot Table layout.With this option enabled, place your cursor in the upper left corner of the pivot table and left-click. This results in the entire pivot table being highlighted. Proceed with Ctrl-x. (I was unable to get this cursor functionality in the non-classic view, but that may be my lack of experience with that mode.)Yellow highlight shows position where I left-clicked.
How do you find the center of gravity of your body?
If an object is rigid you can find its center of gravity by hanging it from several different points and noting where the center lines cross. This is easier to do if the object is flat. A living human body is not very rigid so hanging one from several different points isn't going to work very well. Its center of gravity changes as it flexes. If you settle on a particular position such as legs straight and together, arms straight at the sides, etc. (sort of like a solider at attention) then you could try balancing the body on a thin edge at different angles such a crosswise and lengthwise. The center of gravity would be where the balance planes intersect. This would very hard on you subject. If you could perform your experiment in a weightless environment (such as the space station) you could have a person perform spins around different axes. Where these axes crossed would be the center of gravity. Maybe you could write to NASA and ask one of the astronauts to film someone doing somersaults in mid-air. Less expensive would be to have someone lay down on a frictionless suface such as ice and spin them around. The pivot point would be one axis of the center of gravity. Again this would be hard on your subject.