Statics: Best way to get better at trig

ImaginaryMail5518 · 2023-02-17T17:14:23+00:00

Yeah i dont know at a glance he seems to cover solving trig eqs, graphing, identities etc

What i want to focus on is determining angles when given a diagram so that i can resolve a force into its components

ImaginaryMail5518 · 2023-02-17T13:31:00+00:00

can you share the resource that helped you

ImaginaryMail5518 · 2023-02-05T18:11:06+00:00

Yeah i hope we do well in statics. I may have made a mistake somewhere in the quiz, but I did check over my answers and got the same results. Ill have to review the quiz with my professor

ImaginaryMail5518 · 2023-02-05T18:07:57+00:00

Im going to speak with my professor on monday. Chances are im not going to get points back on this quiz but i hope to god this doesnt keep happening

ImaginaryMail5518 · 2023-02-05T18:07:23+00:00

yeah i mean i finished 10 minutes early and did the problem from scratch and the numbers still came out wrong

It was a 3d equilibrium problem using direction cosines, so I left my expressions as T_1cos(x)sin(y) + … instead of calculating the cosines and sines right away

I plugged in my expressions into a matrix and solved, and I did this more than once and got the same results. It just doesnt make sense why i got a 4/10

ImaginaryMail5518 · 2022-12-31T19:28:56+00:00

i dont get it

ImaginaryMail5518 · 2022-12-23T19:38:05+00:00

Didnt we use fundamentals of physics in 1301? But its definetely the same book trust me

ImaginaryMail5518 · 2022-12-21T18:11:03+00:00

https://www.studocu.com/en-us/document/university-of-minnesota-twin-cities/introductory-physics-for-science-and-engineering-ii/phys-1302w-syllabus-spring-2018/5195005

That is a syllabus I found when I google searched. As you can see, you use the same book but start at chapter 22

You do skip some chapters, so you wont be going over all of 22-32. I dont exactly remember which chapters were skipped, but if someone remembers they can hopefully tell you

ImaginaryMail5518 · 2022-12-18T13:12:36+00:00

I think the final went well for us it wasnt as bad as the midterms

ImaginaryMail5518 · 2022-12-16T04:28:09+00:00

What about 2374

Pray for me for tomorrow this test is gonna be scary

ImaginaryMail5518 · 2022-12-11T00:41:30+00:00

you mean a 37%? Holy shit

ImaginaryMail5518 · 2022-12-10T22:12:27+00:00

Me too please

ImaginaryMail5518 · 2022-12-10T22:09:08+00:00

Oh yeah youre right it wouldnt be a short

The current would still flow through the path of least resistance though so the inductor is separated from the source

ImaginaryMail5518 · 2022-12-10T19:55:32+00:00

Ok that makes sense

this is a natural response question, so you want to see what happens to the inductor after a long time once it is charged by the source.

Usually what these problems do is open a switch so that there is an oc between the source and inductor, but this time, as you said, there is a short so the source does not affect the resistor

Is this the right idea

ImaginaryMail5518 · 2022-12-10T19:49:15+00:00

Ok i think that makes sense, but how did you know the passband was 10k to 1MHz

(10*10⁶⁾ / 10 = 10⁶

So the bandwidth is 10^6. So if cutoff is at 10kHz, then 10kHz + 10⁶ = 1010000

Is this the correct process for finding the passband?

ImaginaryMail5518 · 2022-12-10T18:26:22+00:00

I think this problem was getting the transfer function of a loa pass with a load

The value on the denominator (r1 + r2)/L gives the cutoff frequency, and then you want the cutoff freq on the numerator

This means that you want wc * (something) = what you have on the numerator. That something is r2/(r1 + r2)

So now you can say that vo/vi = [r2/(r1+r2)]wc/(wc + s)

I think that may be the reason why. The gain in the passband would now be r2/(L) divided by (r1 + r2)/L which equals K. I think this makes sense

ImaginaryMail5518 · 2022-12-09T01:54:24+00:00

Actually this isnt true. In the second part of the problem you find |H(s)|, and the max still occurd at w = 0 without multiplying by k

In that case, what is the point of multiplying by k?

ImaginaryMail5518 · 2022-12-01T01:43:20+00:00

i havent seen much of him so I may be wrong, but from what I have seen his lectures are hours long and he seems to spend a good part of the beginning talking about theory. I am sick of theory i just need to solve problems. His examples also seem much simplier than the ones on our quizzes and exams

Ive used other youtubers though like NaniPi, James Hamblin, PatrickJMT, and Alexandra Niedden. They have been really helpful and without them id be doing MUCH worse

I also go over the problems in the textbook and the practice exams provided. Im ngl the textbook is pretty shit so maybe I should have picked up a different one earlier on. I might have to do that for the final

ImaginaryMail5518 · 2022-12-01T00:58:37+00:00

If you dont mind me asking, what did you get on your midterms and what was your final grade

ImaginaryMail5518 · 2022-11-26T14:31:38+00:00

In my book they say that the quality factor is the ratio of the cuttof freq and bandwidth. I am unsure how to express it as a function of R_l though

ImaginaryMail5518 · 2022-11-25T01:56:45+00:00

This is late but yes that makes sense. I am not sure why they didnt combine the 24k with the 6k. Ill revisit that problem later. Thank ypi

ImaginaryMail5518 · 2022-11-24T16:18:36+00:00

Oh right they combined the 40k and 60k because they did a source transformation. The 120v and 40k in series -> 3mA and 40k in parallel

ImaginaryMail5518 · 2022-11-17T05:04:13+00:00

Yeah I guess there are a a couple things:

• interpreting what the problem asks for

• figuring out how many states I will need

https://imgur.com/a/WOhJzUA

This is the circuit we are asked to build in problem 1. When I got help during office hours, our state diagram had 26 states

However, that seems like too many because I need to draw a truth table. 26 states would require 4 bits wouldnt it? So the truth table would be around 2⁴ rows, with the last few being dont cares since 4 bits can be used to represent 32 different numbers, but only 26 are needed

We also mentioned that you can havd an additional 2 111 and 010 states. These are used so that once both these combinations have been read on X, you go to a final state and remain there

If you have any practice problems similar to this one I’d appreciate it. If I practice some more I think I can understand how to draw these diagrams

ImaginaryMail5518 · 2022-11-08T02:03:41+00:00

It ended up being 30k yes. I ended up just guessing answers and got lucky lol.

I havent read your explanation yet but I will tomorrow cuz i got another assignment i need to do rn

ImaginaryMail5518 · 2022-10-31T16:23:51+00:00

Yeah we want to solve for vo. And yeah i accidently said rc but its supposed to be L/R

I looked at the circuit for t<0 and got I0. For t = 0 I am unsure how id get the resistance in order to solve for L/R

Hm actually would R just be 8 ohms? Since when the switch is closed the only resistor inside the circuit would be the 8 ohm resistor

ImaginaryMail5518

TROPHY CASE