How to of the Day

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• How to Assume the Brace Position
• How to Differentiate Polynomials
• How to Talk to a Boy on FaceTime

How to Assume the Brace Position Posted: 09 Oct 2021 05:00 PM PDT It's easy to tune out the in-flight safety demonstration when you're flying on a plane, but the crew is giving you valuable information. If you fly frequently or just want more details on what to do when your plane hits turbulence, you'll probably be told to brace—get into a safe position that protects your head and limbs. Learn the correct brace position so you feel prepared and you protect yourself from serious injury. You probably have questions about when to brace or about technique, so look for your answer below. [Edit]Steps [Edit]When should I assume the brace position? Listen for an announcement or watch for the seatbelt sign to flash repeatedly. If the pilot suspects a rough landing or turbulence, a member of the flight crew will make an announcement and tell you to brace for impact. Depending on the airplane, you may also see the seatbelt sign continue to flash. Take a deep breath and try to stay calm—you know what to do![1] The flight crew might say, "Get into an emergency position," or "Head down and lean forward," for instance. [Edit]How do you do the brace position? Tuck your chin down and bend forward. Check that your seat belt is buckled and tight across your lap. Then, lower your head so your chin is near your chest and bend your whole body forward as if you're rolling into a ball.[2] Drawing your head down prevents your head from jerking back suddenly. Put your hands on your head and press your head against the seat in front of you. Place your hands on the back of your head and tuck your elbows close to your sides. Put your head up against the seat that's in front of you so it will cushion any impact.[3] Remember, it's really important to bend forward so you reduce the distance between your head and the seat in front of you. Don't sit up in your seat and just bend your head over or you could really injure yourself. Keep your feet flat on the floor with your legs tucked slightly rearward. During impact, your feet will slide forward and keep moving even once the plane stops. To protect your legs and feet, plant your feet flat and pull your legs back so your feet are right below your knees.[4] Don't stretch your feet in front of you, even if you keep them flat. Your legs will continue to slide forward so you want them as far back as possible when you brace. [Edit]Are there alternatives to the brace position? Yes—when you're told to brace, make your body compact. If you don't have a seat in front of you to press your head against, don't worry! It's also acceptable to bend forward as much as possible and grab your lower legs instead of putting your hands on the back of your head.[5] Don't bend forward and stretch your arms out in front of you. You want to draw your limbs in close so you don't flail. Keep your feet flat on the floor and remember to tuck your legs back so they won't slide forward as much. [Edit]Why is it important to assume the brace position in a crash? It keeps your limbs close to your torso so they don't flail. This may not sound important, but if your legs and arms are swinging around during a crash, they could hit the chair in front of you or another passenger. Keeping your limbs tucked close prevents flailing and makes it more likely that you can survive the impact.[6] The brace position softens any impact you might have during a crash. If you don't brace and you're sitting straight up, your body will jerk forward and hit the seat or wall in front of you. Bracing brings you closer to the chair or wall so there's less momentum—this means you won't hit the surface as hard and won't get injured as badly.[7] Airplane seats are also designed to absorb shock in the event of a crash. Airlines are constantly testing and redesigning seats to offer maximum protection to their passengers. [Edit]Should I try to hold onto my child or help them brace? No—kids should brace on their own or be in an approved restraint system. You'd actually put yourself and them at risk for greater injury if you pull them onto your lap or you reach over and try to shield them. Instead, direct your child to properly brace. If they're young and weigh less than , they should be in a child-restraint system in their own seat. This gives them more protection than if they were sitting on your lap.[8] The Federal Aviation Administration strongly recommends that you put your small child into a car seat instead of keeping them on your lap.[9] [Edit]Can the brace position kill you if the plane crashes? No—that is simply a myth. Research has shown just how effective the brace position is at preventing serious injury during a crash.[10] It's simply not true that the brace position is meant to harm you! Specifically, bracing can prevent damage to your neck, shoulder injuries, and damage to your legs.[11] [Edit]Warnings Always follow the cabin crew's instructions and stay in the brace position until they direct you it's safe to sit up.[12] [Edit]Related wikiHows Write a CV for a Cabin Crew Position Survive a Plane Crash Land an Airplane in an Emergency [Edit]References [Edit]Quick Summary ↑ https://flightsafety.org/ccs/ccs_may_june98.pdf ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://pubmed.ncbi.nlm.nih.gov/9773899/ ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions ↑ https://www.faa.gov/travelers/fly_children/ ↑ https://pubmed.ncbi.nlm.nih.gov/9773899/ ↑ https://www.faa.gov/data_research/research/med_humanfacs/oamtechreports/2010s/media/201517.pdf ↑ https://www.casa.gov.au/standard-page/cabin-safety-bulletin-no6-brace-positions

How to Differentiate Polynomials Posted: 09 Oct 2021 09:00 AM PDT Differentiation is one of the fundamental processes in calculus. Differentiating a function (usually called f(x)) results in another function called the derivative, written as f'(x) ("f prime of x"). This derivative has many uses in physics and mathematics. For instance, if we graph a polynomial f(x), the derivative f'(x) tells us the slope (the rate of change) of the original function at all its points. The first section of this article teaches you to differentiate each term of the polynomial, one at a time. The second section uses this approach to walk through a typical example problem, differentiating an entire polynomial. After some practice, differentiating ${\displaystyle 5x^{3}}$ will be as second nature as multiplying and dividing. [Edit]Steps [Edit]Differentiating Polynomial Terms Differentiate any constant to zero. A constant is any ordinary number, with no variable involved—for example, 3, -16, or ${\displaystyle 2/3}$. These are freebies in any differentiation problem, because their derivative is always 0. Just cross out that term and move on.[1] Write this in the form ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(3)=0}$. This says "The derivative of 3 with respect to x is 0." The derivative of a term is the "rate of change" of that term: how quickly that term changes inside a function. Since a constant never changes (3 will always stay 3), its rate of change is always zero. Differentiate ${\displaystyle x^{1}}$ to 1. The term ${\displaystyle x^{1}}$ (which we usually write as simply ${\displaystyle x}$) is another easy one to differentiate, once you know the rule. The derivative of ${\displaystyle x}$ with respect to ${\displaystyle x}$ is always 1.[2] Write this as ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(x)=1}$. The notation dx means "derivative with respect to x." This means that we are changing the value of x, and seeing how much faster or slower the other term changes in response. In ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(x)}$, we're comparing the change in x to the change in x. That's the same thing, which is why the rate of change is 1. Write the derivative of ${\displaystyle x^{2}}$ as ${\displaystyle 2x}$. The 2 in the exponent moves in front of the x to become the coefficient (the number multiplied by x).[3]) Meanwhile, the ${\displaystyle x^{2}}$ gets reduced to ${\displaystyle x}$.[4] Have you noticed a pattern? In the derivative, the value of the variable's exponent is always one lower than it was in the original term. ${\displaystyle x^{2}}$ gets "downgraded" to ${\displaystyle x^{1}}$ (which is x), and ${\displaystyle x^{1}}$ gets "downgraded" to ${\displaystyle x^{0}}$ (which equals 1). Since the value of the variable's exponent is called the "degree" of the polynomial, we can say that differentiating a term reduces the degree of that term by one.[5] Differentiate ${\displaystyle x^{n}}$ to get ${\displaystyle nx^{n-1}}$. Or in English: to differentiate a variable x raised to an exponent, write that exponent in front of x as a coefficient, then reduce the exponent by 1. This is one of the most useful differentiation rules. The rules for deriving ${\displaystyle x^{2}}$ and ${\displaystyle x}$ above are actually just specific examples of this general rule.[6] Example: what is ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(x^{7})}$ (the derivative of ${\displaystyle x^{7}}$ with respect to x)? The exponent, 7, becomes a coefficient in front of the term: ${\displaystyle 7x^{?}}$ The new exponent is one lower than the original, 7-1=6. The answer is ${\displaystyle 7x^{6}}$. Multiply by the coefficient from the original term. The coefficient in front of the variable doesn't change when you differentiate the term. If you end up with more than one coefficient in your answer, multiply them together.[7] Example: what is ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(5x^{3})}$? ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(5x^{3})=5\times {\frac {\mathrm {d} }{\mathrm {d} x}}(x^{3})}$ (This means we can find the derivative of ${\displaystyle x^{3}}$, then multiply our answer by 5.) To find the derivative of ${\displaystyle x^{3}}$, make the exponent 3 a coefficient, then reduce the exponent by 1: ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(x^{3})=3x^{2}}$ Plug this back into your formula and multiply the two coefficients together: ${\displaystyle 5\times {\frac {\mathrm {d} }{\mathrm {d} x}}(x^{3})=5\times 3x^{2}=15x^{2}}$ [Edit]Differentiating Entire Polynomials Treat each term as a separate problem. Polynomials contain multiple terms, added or subtracted together. To differentiate the polynomial, differentiate each term separately. You can leave all of the addition and subtraction symbols alone.[8] For example, take ${\displaystyle f(x)=-12x^{3}+x^{2}-5x+6}$. The derivative, ${\displaystyle f'(x)}$, is equal to the derivative of each term, added or subtracted as they were in the original. In mathematical terms, we can write this as: ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(f(x))={\frac {\mathrm {d} }{\mathrm {d} x}}(-12x^{3}+x^{2}-5x+6)}$ ${\displaystyle ={\frac {\mathrm {d} }{\mathrm {d} x}}(-12x^{3})+{\frac {\mathrm {d} }{\mathrm {d} x}}(x^{2})-{\frac {\mathrm {d} }{\mathrm {d} x}}(5x)+{\frac {\mathrm {d} }{\mathrm {d} x}}(6)}$. Get rid of the constant term. If there is a constant (a term without a variable), delete it. Differentiating always removes the constant term.[9] In our example, 6 is the constant. ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(6)=0}$, so we can get rid of it. Careful: only terms with no variables are constants. This rule does not affect numbers that are multiplied by x or any other variable. Move each variable's exponent to the front of the term. Remember, when we differentiate, each variable's exponent becomes a coefficient. If there is already a coefficient in front of the term, multiply the two coefficients together.[10] ${\displaystyle f'(x)={\frac {\mathrm {d} }{\mathrm {d} x}}(-12x^{3})+{\frac {\mathrm {d} }{\mathrm {d} x}}(x^{2})-{\frac {\mathrm {d} }{\mathrm {d} x}}(5x)}$ ${\displaystyle =(3\times -12)x^{?}+2x^{?}-(1\times 5)x^{?}}$ ${\displaystyle =-36x^{?}+2x^{?}-5x^{?}}$ Since ${\displaystyle x=x^{1}}$, we took the "1" exponent and moved it in front of the ${\displaystyle 5x}$ term. Since multiplying by 1 never changes the term, you can skip this step once you understand what's going on. Lower each exponent by one degree. To do this, subtract 1 from each exponent in each variable term.[11] ${\displaystyle f'(x)=-36x^{3-1}+2x^{2-1}-5x^{1-1}}$ ${\displaystyle =-36x^{2}+2x^{1}-5x^{0}}$ ${\displaystyle =-36x^{2}+2x-5}$ Remember that ${\displaystyle x^{1}}$ is the same as ${\displaystyle x}$. Also remember that anything raised to the zeroth power (${\displaystyle x^{0}}$) equals 1. Find the value of the new equation at a given "x" value. You're already done with the differentiation, but there's a common next step in test problems. If you're asked to "evaluate the expression" for a value of x, all you need to do is replace each x in the new equation with the given value and solve.[12] For example, evaluate the derivative f'(x) at x=2. The derivative equation we found is ${\displaystyle f'(x)=-36x^{2}+2x-5}$ ${\displaystyle f'(2)=-36(2)^{2}+2(2)-5}$ ${\displaystyle =-36(4)+4-5}$ ${\displaystyle =-144+4-5}$ ${\displaystyle =-145}$ This answer relates back to the original function f(x). It tells us that, if we draw a tangent line to that function at x=2, the slope of that tangent line is -145. [Edit]Video [Edit]Tips Extra tricky problems might include variables raised to a negative or a fractional exponent. These functions technically aren't polynomials, but you can differentiate them with the same rules.[13] Work carefully, and make sure you are subtracting from negative exponents correctly. For instance, ${\displaystyle {\frac {\mathrm {d} }{\mathrm {d} x}}(7x^{-4})}$ ${\displaystyle =(-4\times 7)x^{-4-1}}$ ${\displaystyle =-28x^{-5}}$.[14] [Edit]Warnings These steps only work if the exponents are constants. If a variable is raised to another variable, like ${\displaystyle a^{x}}$, you'll need to follow the rules for differentiating exponential functions. [Edit]Related wikiHows Solve Math Problems Ace a Math Test Do Math Proofs Calculate Percentages Factor a Number Do Long Multiplication Calculate Your Age by Chocolate Factor Second Degree Polynomials (Quadratic Equations) [Edit]References ↑ https://www.intmath.com/differentiation/5-derivative-polynomials.php ↑ https://www.intmath.com/differentiation/5-derivative-polynomials.php ↑ https://youtu.be/REiDXCN0lGU?t=52 ↑ https://www.mathsisfun.com/calculus/power-rule.html ↑ https://www.mathsisfun.com/algebra/degree-expression.html ↑ https://www.mathsisfun.com/calculus/power-rule.html ↑ https://mathinsight.org/derivatives_polynomials_refresher ↑ https://youtu.be/-CTaxKTzbEI?t=66 ↑ https://www.intmath.com/differentiation/5-derivative-polynomials.php ↑ https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-expressions-and-variables/cc-6th-evaluating-expressions/v/expression-terms-factors-and-coefficients ↑ https://www.mathsisfun.com/calculus/power-rule.html ↑ https://youtu.be/-CTaxKTzbEI?t=314 ↑ https://tutorial.math.lamar.edu/classes/alg/polynomials.aspx ↑ https://www.khanacademy.org/math/ap-calculus-ab/ab-differentiation-1-new/ab-2-6b/v/negative-powers-differentiation

How to Talk to a Boy on FaceTime Posted: 09 Oct 2021 01:00 AM PDT Talking to a boy in person is one thing, but chatting over FaceTime can be a whole new (and nerve-wracking) experience. However, it doesn't have to be! By preparing ahead of time and keeping a few key points in mind, you can have a fun, lively conversation with a boy over FaceTime. [Edit]Steps [Edit]Head to a quiet, private place. There's nothing worse than trying to FaceTime someone with an audience. If you're at home, go into your room and shut the door so you won't be interrupted. Let the people you live with know that you're busy, so they should wait until later before barging in. Make sure your background looks appealing, and turn off anything that makes noise, like the TV or a radio.[1] If you're out and about, try going somewhere that's a little secluded, like a park. Stay away from anywhere too loud, like a crowded coffee shop or restaurant. [Edit]Come up with a few conversation topics ahead of time. You'll feel much less nervous if you already know what to chat about. Before you FaceTime with a boy, spend a few minutes thinking of some things to say. You don't have to write them down, but just keep them in mind in case there's ever an awkward pause. That way, you'll feel more confident and prepared to tackle this FaceTime hang.[2] Think about the background info you already know about this boy for some good conversation topics. Does he have pets? Does he play sports? Do you two go to the same school together? Does he have any siblings? Any and all of these can be used to spark a conversation! [Edit]Give him a few compliments. Start your FaceTime off right by telling him how good he looks. Everyone likes to hear nice things about themselves, and it's a good way to flirt a little (if that's what you're trying to do). Take note of his clothing, his hair, or his smile and give him a quick compliment! Stick to one or two compliments throughout the FaceTime hang so you don't go overboard. Try something like:[3] "That shirt really brings out the blue in your eyes." "Your hair looks so nice! Did you get a haircut?" "You have the best laugh." [Edit]Ask about school or his hobbies. These are easy conversation topics that you can bring up from the start. If you two go to the same school, see how classes are going for him. If he goes to a different school, ask him what it's like there. You can also ask him about what he likes to do for fun or how he spends his free time to get to know him more.[4] Try something like, "How's school going? I'm having a tough time adjusting after summer break." Or, "What's your favorite thing to do on the weekends?" [Edit]Try a few fun hypotheticals. A rousing game of "would you rather" can make you giggle up a storm. If you run out of things to say, try coming up with a crazy hypothetical situation for him to answer. Don't make it anything too serious, and stick to light, funny topics so he knows you're joking. Don't be afraid to answer the question yourself, too! You could try something like:[5] "Would you rather eat pizza for every meal or drink a glass of milk with every meal?" "Would you rather fight 10 duck-sized horses or 1 horse-sized duck?" "Would you rather be stuck on a deserted island or only watch reality TV for the rest of your life?" [Edit]See if he has plans for the weekend. This is an easy way to start some small talk. If he's got something exciting coming up, he can tell you all about it! If he doesn't have any plans, you can ask him what he did last weekend instead. Then, you can tell him if you have any fun plans for the weekend (or you can make some together). Say something like:[6] "Any fun plans this weekend?" "What are you doing on Friday night?" [Edit]Talk about music, TV shows, or movies. See if any of your interests in media overlap. If you've watched anything new recently, tell him about it to see if he's heard of it. If he hasn't, ask him what he's been watching and if there's anything good you should see. Or, talk about a new band you just discovered or a concert you went to. Try something like:[7] "Have you seen that new documentary on Netflix about polar bears?" "I just got tickets to go see my favorite band, I'm so excited." [Edit]Ask about his family. You can learn a lot about someone by learning about their family. If he has any siblings, see if he's close to them or if they ever hang out. You can also ask about his parents and what they do for work or how much time he spends with them. This is a great way to start a slightly deeper conversation without going overboard. Say something like:[8] "What do your parents do?" "Do you like hanging out with your little brother?" "Is your older sister cool?" [Edit]Talk about his relationship status. If you want to get flirty, now's your chance. You might already know whether or not he's single, but it's always good to double check. Ask him if he likes being single or whether he'd prefer to be in a relationship. If he says he's open to dating someone, that's a good sign! If not, that's okay too—he might just not be ready yet. Ask something like:[9] "Are you enjoying the single life?" "How's your love life?" "Any romantic interests going on lately?" [Edit]See what he does to relax. It's fun to talk about self-care practices and stress relievers. If he's in school or has a job, he might need some quiet time to himself to wind down. You can ask him what he does to stay stress-free, and then you can share your own helpful tips, too. Say something like:[10] "What's your favorite way to wind down at the end of the day?" "How do you relieve stress?" "Have you done any self-care recently?" [Edit]Swap embarrassing stories. Get a fun conversation going with some silly memories. Ask him what his most embarrassing memory from school was, or tell him your own to get him to chuckle. It doesn't have to be anything crazy, but it's a good way to get to know each other more in a fun, goofy way. You could also talk about your most recent embarrassing moment or something from your childhood.[11] Bring it up by saying something like: "What's something really embarrassing that happened to you as a kid? Mine was when I accidentally called my teacher Mom. The whole class laughed at me!" [Edit]Make eye contact as much as you can. Try to look at the camera, not at the screen. Although it can feel a little funny, looking into the camera will make it seem like you're making eye contact with him. The more eye contact you can make, the more of a connection you're forming.[12] Plus, making eye contact is a subtle way to let someone know you're into them, so it's a nice way to flirt even though you aren't together in person. It can be tough to look into the camera for the entire video chat. Try to look at the camera while he's talking, then switch to looking at the screen when you say something. [Edit]Smile at him. Your body language says a lot about you. When you're FaceTime hanging with someone, they can only really see your face and maybe your hands. Try to smile and laugh as much as possible so he knows you're enjoying your time together. Laugh at his jokes to let him know you think he's fun to hang out with.[13] If he smiles back at you, it's a good sign that he might like you, too. [Edit]Put on lip balm or lip gloss. It might sound silly, but it draws attention to your lips. Grab your favorite plain lip balm or shiny lip gloss and apply it at least once while you're on FaceTime. Not only will it freshen and moisturize your lips, but it might just get him thinking about your mouth. This is a nice, subtle way to flirt with someone when you aren't together in person.[14] Try to only do this once or twice throughout your video call, otherwise it could look a little silly. [Edit]Be yourself. Above all, it's important to just be you. Even though you might be nervous to talk to a boy on FaceTime, confidence is key! The goal of the video chat is to get to know each other more, so make sure you're being your authentic self. It's fine to be a little more lively or upbeat than you usually are, but don't go so far that you forget who you are entirely.[15] This is especially important if you like this boy or you want to ask him out later. The more he gets to know the real you, the better your future relationship will be. [Edit]Tips If you're feeling nervous, take a few deep breaths before you answer his FaceTime call. [Edit]References ↑ https://www.businessinsider.com/how-to-successfully-virtually-date-according-to-a-dating-expert-2020-4#what-are-common-virtual-dating-mistakes-3 ↑ https://www.businessinsider.com/how-to-successfully-virtually-date-according-to-a-dating-expert-2020-4#what-makes-a-virtual-date-successful-4 ↑ https://www.businessinsider.com/how-to-successfully-virtually-date-according-to-a-dating-expert-2020-4#what-makes-a-virtual-date-successful-4 ↑ [v161710_b01]. 12 January 2021. ↑ https://www.cosmopolitan.com/sex-love/a29992352/what-to-talk-about-with-boyfriend/ ↑ https://metropolitangirls.com/40-topics-to-talk-about-with-your-crush/ ↑ https://metropolitangirls.com/40-topics-to-talk-about-with-your-crush/ ↑ https://www.seventeen.com/love/dating-advice/a25363090/how-to-get-your-crush-to-like-you/ ↑ https://www.cosmopolitan.com/sex-love/a31346416/questions-to-ask-your-crush/ ↑ https://www.cosmopolitan.com/sex-love/a31346416/questions-to-ask-your-crush/ ↑ https://www.cosmopolitan.com/sex-love/a29992352/what-to-talk-about-with-boyfriend/ ↑ [v161710_b01]. 12 January 2021. ↑ https://www.cosmopolitan.com/sex-love/a32599709/body-language-zoom-facetime-signs/ ↑ https://www.seventeen.com/love/dating-advice/advice/a7604/best-flirting-tips/ ↑ https://www.npr.org/2020/05/04/849994266/love-on-lockdown-tips-for-dating-during-the-coronavirus-crisis

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