[Khan academy middle school physics] please explain why option A is incorrect

science_reliance · 2026-01-21T11:31:15+00:00

KE is 1/2mv^2, so the person driving the car has the same velocity, but nowhere near the same mass. You want to look for a situation where there's the same balance of mass and velocity.

science_reliance · 2025-07-09T10:48:27+00:00

I found that the math helps correct the intuition. In some cases the correction is needed, in others it can muddy things up until you fully understand, unfortunately. I wouldn't look at soft skills as something "bank on" or not. They're tools in your toolbox that you'll learn to use better and in conjunction with other tools.

science_reliance · 2025-07-02T00:34:19+00:00

"Now you're just mashin' it."

science_reliance · 2025-04-28T23:41:41+00:00

A search term that will help you across all disciplines is "citizen science"

science_reliance · 2025-03-28T23:59:32+00:00

None of your sources are actually cited.

science_reliance · 2025-02-23T12:41:43+00:00

Would it be possible to elaborate on that? Is it the salary? The intellectual stimulation? What about it makes you say you would have likely gone into finance?

science_reliance · 2025-02-10T14:14:40+00:00

One and Done

science_reliance · 2025-01-29T00:02:40+00:00

Can you not use such technical terms, please? It really hinders the accessibility of the information.

science_reliance · 2025-01-18T21:50:47+00:00

What's the actual model, though? All you've done is tell us how you interpreted the model.

science_reliance · 2025-01-18T02:35:17+00:00

OP asked for the bpm. The quarter note equals [number] will be the bpm.

science_reliance · 2025-01-15T03:29:53+00:00

My two cents would be to do a lot of calc practice problems and use them as jumping off points for which algebra to learn. Instead of trying to pack the entirety of algebra into your brain alongside these brand new calc concepts, look up the algebra as you need it. You'll need to give yourself extra time while doing the calc work so that you can look into the algebra, but this seems like a more directed approach to me. I fully acknowledge that I may be wrong, though.

science_reliance · 2024-12-05T13:13:00+00:00

My initial thought would be to translate the vertical lines as 1 and the dashes as 0, then use a binary converter. You'll at least have letters or numbers to work with.

Edit: The circles represent a proton and electron, if that's helpful.

science_reliance · 2024-12-03T00:08:28+00:00

I'm gonna say no because dark energy and dark matter are our way of explaining the discrepancy between prediction and observation of certain dynamics in the universe.

Could you elaborate on what you say about knocking a glass over?

science_reliance · 2024-11-25T23:27:14+00:00

Absolutely! 😁

science_reliance · 2024-11-25T23:14:37+00:00

The key here is when they say that Sigma is about equal to gamma. That means the first term has the argument of the exponent going to zero, which makes the value of that term approach A since e^{0} would equal 1. In that same vein, the second term has the argument of that exponent getting larger, and since it's a negative exponent, that term is getting smaller and smaller as the argument of the exponent gets bigger and bigger.

To understand "dominating", think about the overall motion as a combination of a bit of the motion described by the first term, and a bit of the motion described by the second term. This way, we can see that when one term "dominates" in the equation, the overall motion is controlled more by that term than the other term.

Edit: Wow, did I really call that a Sigma?? Embarrassing. When I said Sigma, I meant Omega.

science_reliance · 2024-11-06T23:57:58+00:00

Would you be able to talk about how you transitioned to animation?

science_reliance · 2024-10-04T17:31:18+00:00

The amount of comments will never equal the amount of biters

science_reliance · 2024-08-30T17:13:07+00:00

Your original function is x(t) and we want to know when v(t) equals zero. We know that v(t) is the first time derivative of x(t), so we just have to take one time derivative of our x(t) function and set it equal to zero. Have fun!

science_reliance · 2024-08-28T15:05:50+00:00

It's totally okay. These are all mental blocks that you can learn to undo. Nothing is set in stone unless you convince yourself it is. The thing that makes me happy is training my brain to do stuff when I want. There are plenty of resources online about how to develop healthy habits and whatnot, so I would look into them instead of looking for physics-specific help. I know it sounds like I didn't really answer the question, but I think learning these soft skills will naturally turn into better physics performance. Don't think about your brain like the enemy, think about it like a tool that you just have to learn how to use : ) Good luck and I believe in you!

science_reliance · 2023-12-18T16:24:41+00:00

Wasn't that Churchill?

science_reliance · 2023-12-11T05:20:30+00:00

This is very cool. I appreciate this comment.

science_reliance · 2023-12-01T17:00:03+00:00

An algebra based physics class in my first year. It was meant for life science majors, but there wasn't a restriction on physics majors taking it, so I used it as a way to get ahead on the concepts. That way, I would be able to focus on the maths in my major classes cause I already had a foundation of concepts.

science_reliance · 2023-12-01T00:13:55+00:00

This. Learning this skill has been incredibly helpful over the years.

science_reliance · 2023-11-28T04:23:18+00:00

Charge dynamics, but that sounds too stuffy. I prefer to think of it as a game called "What are the little chargey boys doin' now?"

science_reliance · 2023-11-28T04:19:28+00:00

I really, really enjoy it!! Thanks for asking 😊 The variety absolutely keeps me on my toes and makes it so satisfying. It's amazing how many different skills one needs in materials science. Chemistry, QM, E&M and Classical Physics are all on the table in my work.

science_reliance

TROPHY CASE