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I feel like none of these are correct but I have no idea. The answer is D, but if water was added, wouldn't the reverse rate decrease as the concentrations of the ions decrease? I'm so confused

[AP PHYSICS 1] Energy and Work

i don’t understand energy and work like at all- i can’t figure out how to calculate total energy either 😭 i know it’s like KE+PE but how do i find either of those??? Along with that what is the difference between work and energy?

Am I tripping or is this correct? The answer key says that it’s a horizontal shrink by a factor of 2 but that doesn’t make sense?

Can someone please explain how I solve m of angle JKP, JP and PL. thanks

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Can someone please look over this proof to see if it is correct? The theorem I am trying to prove is written in blue, and my work is beneath that. Thank you

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I couldn’t find a really good flair so apologies.

I have been on this same excel sheet for a long time, I even got an extension from my professor and I have absolutely no idea how to do this at all!

For context I have 100 data points and I have to do the ml and lse estimates for beta and gamma for gamma distribution , and I have absolutely no idea how.

I’ve done things like mean, ln mean, ln of the data points, but what else do I even do? I might just give up honestly and take the loss.

By any chance does anyone know how to create a T1 mapping from an extracted k-space quiescent window using MATLAB?

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Why is the entropy of these dissolutions negative? Don't aqueous ions have more entropy than solids so shouldn't it be positive? Because don't you write the solid on the LHS and the ions on the RHS

In an instrumental variable study, I have the point estimate of the outcome (a health outcome) and the corresponding confidence interval. I also have the mean of the instrument and the range (number of health worker visits in a year in a given population). I have to calculate how the confidence interval would change given a change in the instrument. That is, how the health outcome would change if the number of visits by the health worker changed. Can someone please guide me on how I can calculate this?

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Guys how do I solve this? I have tried integrating both parts and it’s still not the right answer. Thank you so much!

NOTE: it is NOT because the E is uppercase or because E0 is redundant. All answers require it to be in E notation no matter what.

Hi all, I’ve been out of school for a few years and have to upgrade my chemistry because I didn’t take it in high school.

This question about calculating the heat of a reaction. I’m sure my calculations are all correct, but I keep getting answers wrong and I think it’s because my rounding is incorrect.

In this program, we get two chances to answer before it is marked wrong. When it is marked wrong, we do not get the right answer which sucks. I entered both -1.1E0 because it is exothermic but then also tried 1.1E0 because I second guessed.

I know when you multiply you take the smallest figs that you are given and that is the number you round too in your final answer. From my understanding 250 would be the number with the smallest sig figs so it would be to two sig figs? I don’t understand why it is wrong. Someone in class said something about adding a decimal to the end of it (250.) but can you just do that?

both my math teacher and tutor solved this differently with different answers... can someone help me out please, thank u.

I don’t even know how to start on this problem

the way we usualy solved these is

1. find the range of accepltable values of x
2. raise both sides to the power of 6
3. simplify

but in this exercise i don't know how to simplify it

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English isn't my first language, but here is roughly how the exercise should be translated:

On the sea, two ships travel in a straight line towards the intersection point of their routes. The first ship travels at 80 km/h in a southern direction, while the second one at 40 km/h eastwards. At noon, the first ship is 400 km away from the intersection point, while the second one is 300 km away.

a) What is the distance of the two ships at 12:00 and 13:00? (noon and 1 PM for Americans)

b) If the ships travel at a constant speed without stopping, when is their distance the smallest?

c) What is the smallest distance?

First of all, the exercise doesn't quite say weather or not the ships actually went by the intersection point by noon. In other words, the first ship (let's call it ship A) can be either 400 km north or 400 km south from the intersection point (let's call it point O) at noon. Likewise, the second ship (let's call it ship B) can be either 300 km west or 300 km east from point O. I think the creators of the exercise probably meant that neither ship has passed through point O as of noon (A is 400 km north and B is 300 km west from O, I called this Case 1), but I want to solve for all four cases, just for fun.

I ran into a problem at Case 2, the case where A is 400 km north and B is 300 km east from point O. First of all, it's easy to see that at noon, triangle ABO, in all four cases, is just a scaled up version of the 3-4-5 right triangle, so the distance at noon will be 500 km. In the next hour, ship A moves 80 km closer to O, while ship B moves further away by 40 km. This means line segment AO (let's call it a) will be 320 km, while line segment BO (let's call it b) will be 340 km, and the length AB is √(320² + 340²) = √218000, or about 467 km. In general (for Case 2), the length a can be expressed as |400 - 80t| and the length b as |300 + 40t|, where t denotes the amount of time in hours that has passed since noon.

This exercise is at the bottom of an exercise sheet with exercises that can be solved by using the various mathematical means and the inequalities between them. The inequality between the quadratic and arithmetic hmetic mean says:

√[(a² + b²)÷2] ≥ (a + b)÷2

√(a² + b²) ≥ √2 • (a + b)÷2.

The minimum value of the left hand side (which is the length of the desired distance) is at equality, while equality holds up if and only if a = b, and thus

|400 - 80t| = |300 + 40t|.

The absolute values of two numbers are the same either if they are equal:

400 - 80t = 300 + 40t

-120t = -100

t₁ = ⅚ hours (50 minutes),

or if they are the additive inverses of each other: -(400 - 80t) = 300 + 40t

80t - 400 = 40t + 300

40t = 700

t₂ = 17.5 hours.

The 17.5 hour solution doesn't give a minimal value, because the ships would be 1000 km away from O by 5:30 AM the next morning, which is of course too big. But here is the problem: the other solution of ⅚ hours doesn't work either, because at 12:50, the ships would be ¹⁰⁰⁰/₃ km from O and √2 • ¹⁰⁰⁰/₃ ~ 471 km from each other, which is bigger than the distance ten minutes later (see above), so this can't be the minimum either. So what can be done? How can this and the other cases be solved?

I found that by taking the x and y values of theta which would be cos(t) and sin(t) and times each by the radius, 7. Then I multiplied by two and found the absolute value to get the full function for the rectangle. I feel like this should be correct but I’m still marked as wrong. What am I doing wrong here?

Hi! Doing my dissertation on whether or not large learning models (LLMs) are capable of replicating the specific style of an author and one of the points of comparison I'm using is the Flesch Kincaid metric. However, I have scoured the internet and cannot find a decisive answer for the scores on any of Austen's works (she's my author of focus). Does anyone have an idea off the top of their head? TYIA!

Jack's mother is a homemaker, along with her household work, she planned to raise goats. For this, she borrowed ৳50,000 from her husband and ৳100,000 from one of her sisters. The condition is that Jack's mother will get half of the profit after deducting the expenses from the sale of the goat, and the other half of the profit will be shared by the husband and the sister in proportion to the amount paid by them. Jack's mother bought five baby goats for ৳150,000 and reared it for a while. She spent ৳100,000 for the goats' upbringing. After the goats grew up, she sold it at the village market for ৳550,000.

a. Determine the rate of profit.

b. Who will get how much money as profit from the sale of goats?

The problem I am having is do you include the borrowed money as cost with other expenses, or she paid the price of the goats with loan so it doesn’t count?

(btw, if you’re wondering what currency that is, it’s taka. Also, if you think the question is really not specified, then don’t blame it on me. Those are the exact words in the book)

It's just clicking a bit slow for me, on what exactly happened during that part of the calculation like how did it transition to (x + 7/2)^2

Hello! I am very stuck on this problem for physics homework. I have gotten it down to a single equation but for some reason I cannot solve the algebra.

sqrt(2x/9.8)=sqrt(x/9.8)+1

I have been trying to solve this problem by

squaring everything and then from there, multiplying everything by 9.8.

The answer I get is x=9.8.

However, this answer does not match the one given on the answer key so I am pretty sure that I am just missing something obvious when I am trying to solve it.

Thanks in advance :)

Please help me, we never really went over this in class. How would I find the answer?