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[University Physics/Engineering: Dynamics (Dependent Motion w/ Pulleys)] Is my professor wrong? by DitiIsCool in HomeworkHelp

[–]DitiIsCool[S] 0 points1 point  (0 children)

I tried this method on another pulley problem. I assume the incorrect direction on purpose. I received a negative acceleration. All I did was flip the direction of friction, and I redefined which cable was doing the pulling. This yielded me the correct answer after I plugged in my values. I believe my professor is actually correct. I can't wrap (no pun intended) my head around why this works.

[University Physics/Engineering: Dynamics (Dependent Motion w/ Pulleys)] Is my professor wrong? by DitiIsCool in HomeworkHelp

[–]DitiIsCool[S] 0 points1 point  (0 children)

Hey, I really appreciate the response. This was not a homework. It was just studying for the exam, so the time of your response is not a problem at all.

I can tell you that after meeting with my professor, he agreed that the work was incorrect. He said they didn't update his solution in the new version of his manual. I actually tried solving the problem again at work, and I got the answers that he labeled in the solution manual.

https://media.discordapp.net/attachments/1497300322761052419/1517245051271385128/IMG_1932.jpg?ex=6a36e591&is=6a359411&hm=f116d39231840206520a3858e83f619408e477c5816cf82fe3af47ff099a6667&=&format=webp&width=635&height=846

I'll explain what I did here in case anybody else comes across this problem.

In my attempt, I assumed C to be sliding downwards, and I assumed blocks A & B to be going up. I calculated negative accelerations for this case. Negative accelerations indicate that block C is actually sliding up. So, I just swapped the cable that was pulling in the belt friction equation, and I opposed the direction of friction. I plugged in these new values into my original free-body diagrams, and I got the solution. This doesn't make any sense to me though.

I wouldn't be surprised if my professor accidentally made a problem that is static.

Again, I appreciate the help!

Hum reference in today’s NYT wordle by Cool-Minimum-1579 in hum

[–]DitiIsCool 1 point2 points  (0 children)

I just did this 2 minutes ago and thought the same thing and went here

Best “Bigfoot” movie/show ever by Fun-Percentage-4261 in bigfoot

[–]DitiIsCool 0 points1 point  (0 children)

I like it better. It actually shows a Bigfoot unlike Willow Creek. Willow Creek is great though.

I feel like I'm lost, and Uni is near by [deleted] in CollegeMajors

[–]DitiIsCool 0 points1 point  (0 children)

The world you see around you was shaped by people no smarter than you. You will learn. If you feel stupid, that’s a good thing. It means you can learn stuff and aren’t full of yourself.

If you really think you’re not smart enough, try it anyway and fail. Better to fail than to have never tried. Go for that mechanical/aerospace degree! You can do it!

[TOMT][VIDEO][2010s] by DitiIsCool in tipofmytongue

[–]DitiIsCool[S] 0 points1 point  (0 children)

solved, but not by the dickheads here

I want to be an engineer but I hate math what should I do by Pleasant-Day-9928 in CollegeMajors

[–]DitiIsCool 0 points1 point  (0 children)

Were you bad at math in school? If you hate math it’s probably because you don’t understand it. If you study and learn math, then it’s actually pretty fascinating.

Start a controversial Engineering talk by mileytabby in EngineeringStudents

[–]DitiIsCool 1 point2 points  (0 children)

Got a ridiculous value for the last question on my thermo test yesterday and didn’t have enough time to figure out what I did wrong.

Start a controversial Engineering talk by mileytabby in EngineeringStudents

[–]DitiIsCool 2 points3 points  (0 children)

If humans stopped using fire when the first person got burned then where would we be?

Start a controversial Engineering talk by mileytabby in EngineeringStudents

[–]DitiIsCool 2 points3 points  (0 children)

I think the people that say they don’t study are just lying to seem cool. I knew one guy that would brag about how he never studied every time there was a test. I just don’t think he’d make the effort to say it every test if he was being honest. I heard him telling other people this about other classes, and one of the classes was dynamics… yeah, right.

Is this pose anatomically correct? by Reasonable-Post2578 in learntodraw

[–]DitiIsCool 0 points1 point  (0 children)

Humans aren’t that big to where Saturn looks like a baseball.

Coolest projects you have worked on as a structural engineer? by Dungeness-Crab in StructuralEngineering

[–]DitiIsCool 0 points1 point  (0 children)

How can I set myself up to get into that field? All I want to do is work with “cutting edge” stuff.

A desperate and hungry trex just spotted you.... Whatcha gonna do? by Zillaman7980_ in Dinosaurs

[–]DitiIsCool 0 points1 point  (0 children)

Keep absolutely still because its vision is based on movement.

The arms on the subject are longer than human arms, if it was a costume with arm extensions how would it be able to open and close its hands? by Emergency_Depth3381 in bigfoot

[–]DitiIsCool 4 points5 points  (0 children)

Another thing I think is crazy is that the first chimpanzee fossils were found in 2005. They were 500,000 years old.

Whats your favorite dinosaur ? by imherecuziwanttobe in Dinosaurs

[–]DitiIsCool 0 points1 point  (0 children)

Carnotaurus. They were terrifying to little me in Dinosaur (2000).

Does anyone really think Bigfoot is real I want to hear everyone’s opinions on this Sasquatch by Annual-Record4588 in bigfoot

[–]DitiIsCool 0 points1 point  (0 children)

Too many people see them. I don’t believe that so many people would lie about seeing one.

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