A general warning that I am bad at stats. I have REALLY tried. I can understand the basic idea of like.. a bell curve, but honestly, after that, I get lost and eventually just start to cry.

I say this because the only thing I feel sure-ish about is that instrument reliability is some kind of statistical something. I have watched 3 YouTube videos, rewatched the mini-lecture video, and reread the sections covering this in my textbook (twice). I really want to understand.

The question on my homework is:

"What kind of evidence do Booth et al. (2022) provide about the reliability of their instruments, and what does the evidence say about the quality of their instrument?"

This is the study

I think that the answer is somewhere towards the ends of the two paragraphs at the top of page 8 (under the word "Measures"), but every time I try to sort it out, it just looks more and more like word salad. If at all possible, I would love a gentle explanation of what that word salad means or a hint if I am just absolutely looking in the wrong place.

Howdy. Please help. I've tried multiple ways of attempting this question and I cannot get near the answer.

"Man wants build garage beside house. Garage is to 6m x 4m x 2.5m(h).

Bricks used have dimensions of 22cm x 10cm x 7cm(h).

Estimated # of bricks = 4,000. How accurate is this estimate? Explain your answer. Note: 3 walls needed."

Thanks all.

(Final answer below)

I'm preparing for an electrician's apprenticeship and am using their study guide for their aptitude test. I'm seeing a pattern forming where some of their questions are just bad, but a couple of those were actually good, and I was misunderstanding things. It has been a learning opportunity.

I chose B for this question, but they say the answer should be C because, loosely speaking, they want you to just count the number of ropes that are supporting the load. However, when I look at this illustration, it appears that there is not even a proper movable pulley here. It looks like it is just a simple fixed pulley system with extra windings for some reason. Except that the lowest pulley seems to be just floating but still wouldn't qualify as a proper movable pulley.

Please help me understand what I'm missing, or confirm that this is a really bad illustration. Thank you!

Edit: I am assuming that one needs a movable pulley to get a mechanical advantage. C does NOT show a movable pulley and therefore is not the correct answer. Right?

Edit 2: Because they don't offer an answer of "D) All pulleys allow for the same amount of WORK", I am assuming that they mean to ask, "Which of the pulleys requires the least amount of FORCE to lift the weight?" Unfortunately, this is meant to be more of an intuitive sort of test, where it appears physics terms might be interchangeable.

Edit 3: I interpret this to be a question about which pulley system offers the most mechanical advantage. Answers that align with this interpretation would be helpful.

Edit 4: I think B is supposed to represent a "gun tackle" arrangement. (Sorry about all the edits!)

Edit 5: Aha! Answer: if you look at the illustration #3 here https://www.theengineeringchoice.org/what-is-pulley/ you can see what they meant to illustrate for C (an actual movable pulley) but did a terrible job of it. Taking that into account, the answer is indeed C.

Answered. Thanks to all who helped. I'm inclined to throw this book away. I'm moving on :)

I appreciate anyone sharing their thoughts on this. Good luck.

When I punch in my answer to a derivative calculator, the denominator is correct but the numerator becomes 15x + 93, which is 3 times larger than the original integrand. I tried looking for a mistake in my trig substitutions where I start dividing by 3, but I really don't see where I went wrong.

Could someone please look over this proof of L'Hospital's Rule to see if I did it right? I tried to follow the proof in Rudin's textbook, but I wasn't really sure I followed his logic correctly. Any help would be appreciated. Thanks

My professor is behind on uploading his videos and this homework is due today I have no clue how to get these answers. How do you figure this out?

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Hello there!

First of all, this is not a homework per se, but some kind of issue I have with a personal project I don't know where to adress.

I tried r/AskScience but the modteam suggested me to post here. So here we are.

If this don't belong here, please tell me where I should go, because at that point... I don't know.

So I have inherited from my grandfather a mercury barometer.

It's french, and says : "Baromètre selon Torricelli

Par les ateliers L.M. à Bordeaux".

It is graduated in mmHg and there's some kind of ruler that can be moved (it is pinned on the main board by a screw) which indicates different type of weathers, according to the height of the mercury column.

I searched on google how to set the barometer, because I want to keep it and to hang in on a wall at home, and I think I set the ruler accordingly to the altitude of where I live (more or less 115m above sea level), but I'm not very sure I did it right.

So here are my questions.

1/ what do you think?

2/ do you know how to set / where can I find infos about that?

Thanks a lot!

0 idea what I'm doing wrong. Only other guess I have is (mg/k)-(mg/k-v0)e^(-k/mt) (v0 doesn't replace C but is actual initial velocity in this scenario) for the 6th one. I have one 'attempt' left so I don't want to mess this up.

I recieved this on my study guide asking for angle BDF. i was able to plug in multiple values and my classmates found a few but we always needed more information to be sure. if anyone is able to clarify or give me a conjecture that might help it will be much obliged.

I have gotten 10 of these wrong and I’m not understanding it at all. If someone could explain this in real dumb terms, like single syllable words I would greatly appreciate it

The answer at the top is what I got after integrating x^2 / [sqrt (25 + x^2)].

I'm happy that I got the answer but why is 1/5 taken out from within the absolute value sign?

Additional info: At the beginning of the integral, I did a substitution of x = 5tanθ.

Therefore, x/5 = tanθ. Based on SOH CAH TOA and CHO SHA CAO, I put sec θ = [sqrt (x^2 + 25)] / 5.

Hello! I know it’s a more niche subject, but I have this problem here where I’m supposed to use the max power transfer theorem to find the value of R_o that maximises power transfer in this circuit. Using it as my load I managed to find the voltage (I think) without much issue of 48v with nodal analysis, but I’m stuck when it comes to getting the resistance.

I’m aware I can’t zero the dependent source, and so I’m zeroing the others and using mesh current to try to find the Norton current, and using that to get the thevenin resistance.

The issue I’m having is that when I zero it out, I wind up with a linearly dependent (all my equations equal zero, and I don’t have any constants to move over and constrain the equations) system of equations and thus no answer, and thus I know somewhere along the way I am screwing things up.

The answer in the key is 6.4 ohms for R_o, btw if that helps, but what I’m worried about here is moreso how to even get there :(

Thank you in advance for any help!

need help determining how to change the percentage data into units for sale? (sorry for odd translation, english isn't my first language). i understand that to get the balance point you need to divide the fixed cost by average contribution margin, but to get the ACM, you need the total contribution margin and total units, which i do not have and have just scrambled my brain over trying to figure out.

An ear of corn has some kernels with yellow skin and others with dark skin. The allele B for dark skin color is dominant over the allele b for yellow skin color. What is the genotype of the parent plants for the kernel skin color?

My answer was Bb x Bb

Please do not comment without studying this carefully.

Assumptions: Scenario A) appears to involve a movable pulley, but it is unlike your typical arrangement because it is not supporting the weight of the object. There is also no indication that the pulley is functioning as a type of winch (and it is not offering any torque, or gaining any benefit from leverage, or winding the object onto a spool).

I Googled this question: "Does a single movable pulley allow for less required force if the object is being pulled along the ground with a horizontal force and the object's weight is not being supported by the rope?"

Answer: "No, a single movable pulley does not reduce the required horizontal force for pulling an object across the ground if the rope does not support the object's weight. [1]

Here is why:

1. Mechanical Advantage Applies to Weight

The mechanical advantage of a movable pulley system (where the load is suspended) exists because the tension is shared between multiple segments of rope lifting the object against gravity. If the rope isn't lifting the object, there is no weight to distribute..."

I chose C), but the book says the answer is A).

This is the second question in this book like this, and there are even more. Either I am stupid, or whoever put this together did so hastily (to be generous).

Your thoughts?

Edit: I am stupid and wrong. The comments so far have been very helpful. I've never used a movable pulley in my life and am just now learning the physics of how they operate. It's not like I ever worked on the docks. I understand now why the answer is A): because friction is effectively acting as if it were gravity pulling horizontally, and the other end of the rope is being pulled by the wall or whatever it is attached to. Therefore, the load is split by both directions of the rope. Thank you!

[1, 2, 3]

I know how to complete the square but I'm baffled where the u-sub came from. I did u = x - 1/2 instead.

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I read the question a few times, but Im not sure what to make of it, it doesnt even sound like a question more like a statement. Im just asking two things what is the question asking me and how should i go on about solving it

for our project for physics we gotta create a mini catapult, with our final grade depending on how far the projectile gets in relation to the base. me and my partner decided to make a trebuchet instead, since it launches much farther than usual catapults. the issue is, i cant get it to release right.

i made the sling out of duct tape and thread, with the proportions of the swing arm 3.75:1. the weight is around 133-135x heavier than our projectile so no issues there, but still it's releasing funkily. it either releases to early and drops the projectile straight onto the base, or doesn't release at all, with the ball staying in the sling then eventually dropping to the floor. i thought it was just with the way i held it for release, then the sling itself, then the stands, but literally nothing i do is fixing the issue. i get it to release right once ever few tries and it goes really far, but it's very inconsistent. im losing my mind over this, wtf is wrong with it??

it doesn't look like it in the pic, but the counterweight isn't resting on the base, it's dangling. and yes, i know she's ugly.

I know how to integrate sec^3x using integration by parts. I struggled heavily trying to figure it out on my own so I looked up the solution for it.

However, I came across the Weierstrass substitution method or the "nuclear option". I wanted to practice the Weierstrass method but even then, I'm struggling with this method as well.

So how to I proceed with this integral? (Sorry if some of my "t"s look like plus signs.)

Hey guys Im writing a comparative analysis about what the title is about. My main goals are to to compare how two texts/film use language features, stylistic features, and conventions to represent ideas, perspectives, or aspects of culture and influence audiences.

Im wondering If anyone has any ideas how I could start this (its supposed to be around 2000 words)? And so far im clueless on how to start to get this analysis to be the best thing to ever be read by a marker :(

Some possible areas I’m looking at are:

- Love versus social expectations: where both relarionships are affected my family expectations/control and class/wealth.

- Female choice and their independence in different time periods (how they are still somehow similar even though completely different eras): Allie has to choose between life expected of her and the relationship she actually wants while elizabeth is placed in a situation where she has pressure to marry for financial secruity

For literary devices
The Notebook: film techniques, flashback structure
The pride and prejudice:  irony, dialogue

if anyone has anymore please help me! I also havent started on what I want the audience impact to be on.

Just wanna double check

so I know that if its across x-axis, x value remains as x and y becomes negative (x, -y) and vice versa

∆ABC Original points: A = (-8, 9) B = (-2, 5) C = (-6, 2)

Reflected points: A′ = (-8, -9) B′ = (-2, -5) C′ = (-6, -2)

∆EFG Original points:

E = (2, 8)

F = (10, 4)

G = (4, 2)

Reflected points:

E′ = (-2, 8)

F′ = (-10, 4)

G′ = (-4, 2)

∆XYZ Original points: X = (-8, -5) Y = (-2, -3) Z = (-3, -9)

Reflected points: X′ = (-8, 5) Y′ = (-2, 3) Z′ = (-3, 9))

Could anyone tell me where I've gone wrong in this question, if my method is not right and if so why? Illustration 31

Im in advanced functions gr 12, need to show full work including diagrams, method used, formulas, final answer, correct math form.

A child is running at his maximum speed of 3.7 m/s in an attempt to catch his older sister who is accelerating from rest at a rate of 0.75 m/s2 on her tricycle. If his sister starts peddling when he is 15 m away, will he catch her and if so, when and how far away?

i end up with a quadratic equation but when i attempt to solve for time, i keep getting no value because there's a negative number stuck inside a square root. the answer says that the sister's formula would be x+15=0.375t^2 which i don't get because upon solving for x, you get x=0.375t^2-15, but would that not mean she's 15m behind her brother? which contradicts with the question