Recent content by blixel

Homework Statement A subdivision lot is 200 ft long by 80 ft wide. A surveying crew made an error of 0.10 degrees when setting the iron pin in the corner of the lot shown. By what distance is the correct pin off of the true corner? Homework Equations I think I'm doing this one right...

Thanks for checking it over. The work felt right, but the image suggests a steeper angle, so I wasn't confident.

Homework Statement A building is 400 ft tall and has suffered damage from a recent earthquake. If a surveyor is stationed 150 ft away, sets a zero angle on the bottom corner of the building, and turns the angle shown to the top of the building; what is the angle at which the building is leaning...

Well the project is finally over. Yesterday was demonstration day. The design my group chose proved to be too complicated and we weren't able to get a working prototype in time. However, we still demonstrated what we had completed. At any rate, here are some short (<1 minute) video clips of the...

Ok I was not aware of that. I will definitely have to find a different motor.

In message 49, I mentioned that I already got the motor. But later in the same post, I did say that I was open to the idea of finding an alternative. For the sake of the project budget, I'm only including the costs for the items that actually go into the finished project. If I end up with extra...

Yeah, this is also an area of the build that is proving problematic. Once the motor (and speed) are solved, then there is the issue of figuring out where to get a matching gear and belt.

So if I understand this whole thing correctly, the motor I got, plus a https://www.amazon.com/gp/product/B00UMK4NKG/?tag=pfamazon01-20 would allow me to control the speed of the motor? Though, it does seem like the link you posted is a better value as you get all the parts in one + battery and...

Well, when I connect the motor to a DC power supply (like a 6V lead acid battery or DC variable power supply), the motor just spins as I would expect any motor to. It just spins way too fast for my task. Yes, I do think 210 lbs of force is probably more than we need, but if you refer to the...

Continuing on with this ball launcher project... nearing the completion date, so one way or the other, it will be over in about 10 more days. The motor I got was https://www.amazon.com/gp/product/B009YES7EO/?tag=pfamazon01-20 motor from Amazon. According to Page 8 of the manual, it has a...

Ok, I'm able to repeat your values and get a list, but if I change just about anything, there are no results. After holding some springs in my hand at the store, and stretching them a bit, my feeling was that 4 inches isn't enough. So I plugged 6 inches into the spreadsheet to generate a new set...

ha, yeah - I understand. I think in my case it's a matter of wanting to solve, what seems to be, a reasonably simple problem. But being inundated with so much extra information that it makes me want to give up on the math, and just figure it out through experiment. At any rate, the main reason...

Ah ... so the mass should be (tennis ball + chair + 1/3 of the spring). I'll definitely keep that in mind once we get done with the paper and pencil portion and start the actual build. That will be an easy adjustment for me to make on my end. Since I'm using the spreadsheet, and since the...

If the steps are valid, then I trust the spreadsheet to handle the arithmetic. And I walked through the steps to see how the units cancel and become ft-lb (or lb-ft). So that is also clear to me now. Thanks for that. As far as going to the next step of calculating the Spring Constant, that...

Trying again... Does this much seem valid?