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Mechanical Engineering

The Big B

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  1. Good news gtakaz, Good news gtakaz, You can have both, but it will be complicated. The LED strip will be the easiest to install, but it won’t with your power supply. The Strip runs on 5v, and the power supply outputs 3.7v. It’s easy to fix though; go to the store, get a portable cell phone charger, and plug the led strip in. The Strip used 2.88w/m according to your link. If you get a 5000mAh battery and 1m of LED’s, it should last 8.7 hours. If you really want the LED too you’ll need a few things, and you need to read the rest of this before you do. Get a portable charger with 2 usb ports, some wire cutters, 4, 20 ohms or higher resistors, some female prototyping wires, normal wire, electrical tape, and a usb cable like the one in this link: https://www.amazon.com/Onite-5-5x2-1mm-Positive-Electronic-Organorgan/dp/B01MZ0FWSK/ref=sr_1_5?dchild=1&keywords=USB+to+DC&qid=1591301064&s=electronics&sr=1-5 Firstly, you’ll need the female prototyping wire because you can make circuits without soldering them together, and you can use any usb cable but usb cables come with 4 lines: power (+), ground (-), and 2 data lines. If you can sort them out, get any usb cable. If you don’t want to, get one like the one in the link; there’s less to confuse you. Cut open the usb cable, find the wires you want. Connect the positive wire to the positive end of the LED, connect the LED to a resistor; connect the resistor to ground. Don’t connect the LED without the resistor; LED’s need resistors or they’ll make too much current and burn themselves out. Also, I want you to do this first because LED’s need to be wired a certain way. The positive wire needs to go to the positive LED wire, otherwise it won’t light up. Spend this time figuring that aspect out. Lastly, you can go much higher than 20 ohms, and the LED’s will be plenty bright, but they won’t be as bright with lower resitance. You can actually go much lower than 20 and still be fine, but I’ll leave that as a challenge for you. Tip: do the calculations first! Once you’ve turned the USB cable into a power supply, and figure out the LED configuration, just connect the wire together like in this diagram I made. If you have a charger with say 5000mAh, and wire it up the way my diagram shows you should get a little over 5 hours of lighting, and charging it will be easy. Just make sure you attach it to the bottom of your skateboard well. .
  2. dudleybenton is correct, we need more details to answer your question. Heat exchanges are very nuanced, and there are dozens of variables that can alter your question. How about you list what fluids, liquids or gas, you're looking into, and what you're trying to do with them? Specifically we need their temperature, pressure if it's really high or low, and how much fluid you're trying to move. Also could you be more specific by Capacity? I'm not sure what you mean. If you'd like a crack at it, here's a you tube video that gives a good start to the subject:
  3. Hello Tristan, Here are the calculations I did for this problem based on the info you provided, I hope you can read my hand writing. The average torque will be .00246 Nm. I wouldn't put any weight on this if I were you. This doesn't include the affects of gravity which will over power everything else in this equation. I would have put it but there was no information, so I assumed it wasn't applicable. If I'm wrong, I suggest you recalculate it. There are also other things, I put in the paper so please read through it. Lastly, this was a weird thing to calculate because you put a lot of linear measurements into an angular force: Torque. I think that's were you had trouble. Hope it helps, Bobby
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