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Hello, my name is Max and I'm a senior in high school. Since everyone else is talking about the sports they play...I will too. My mother often asks me to stop playing tennis because it is such a physical sport, but I rarely listen to her so I continue to play at a varsity level. I can't have any pets except a boring fish because my dad is allergic to the fur on cats and dogs. At the moment I work at a restaurant called Hose 22 and I usually prepare food. I'm taking physics because it was recommended to me by my counselor. But I am excited to start physics because it looks like its going to be very different from all the other science classes. I also really want to learn more about the different forces that can act on objects.

If you wanted to, you can change your name and remove your last name in the settings! Enjoy physics!!

Thrilled to help, and welcome to the APlusPhtsics Community! The short version... The College Board says you need to know how to derive them. Very rarely have they asked students to do so, but it has happened... This guide sheet may help with studying: http://aplusphysics.com/courses/ap-c/tutorials/APC-Dynamics.pdf Good luck!

Thank you dearly

Bonus $20K to team BCD for the Kerbal Royal Wedding Painting!

Hi Gio. APlusPhysics is just a single person, me, so that's pretty easy to answer. They are on my to-do list, but are at best a month or two away. Note that most of this material is covered to at least some depth in the "Honors" physics video series. Hope that helps! -Dan

Welcome to APlusPhysics -- hope your studies go well this semester!

Money should not be spent to furthur study Particle Colliders. The united states economy is terrible and so money should not be wasted on information that we can live about. The information obviously has important benfits. We could feed children in ghana instead of spending money on science that is not needed. The money could go towards helping developing countries to provide water and food and items essential to live. We would unfortunately not have MRI's but kids in foreign countries are more important. The research for particles colliders is just too expensive to be worth it.

BREAKING NEWS recently three students, Mike Belmont, Zach Haight, and Jake Barnes have found acceleration by gravity ina series of steps including using meter sticks to determine the height from the ball too the ground from the cieling of a classroom. by doing so they measured the time it took for the ball to hit the ground and also measured in metersthe height of the ball off the ground. they determined the acceleration by using a formula to determine distance and used conversions to find the acceleration of 8.98 meters per seconds squared. we can use this to determine acceleration on earth due to gravity. the percent error was 8.48 percent from the actual acceleration of 9.81 meters per second squared.

Article: Breaking News! West Irondequoit physics students have calculated the acceleration due to gravity! In a physics lab students participated in, they used only a stopwatch to find the acceleration due to gravity. They dropped a ball from the ceiling of their classroom and used only the initial velocity, height of ceilings and the time it took for the ball to drop from the ceiling to find the acceleration due to gravity with an equation. When calculating this, they had only 3.98% error from the actual 9.81 m/s2. They got 10.2 m/s2 for the acceleration due to gravity. The students that preformed this lab had a breaking discovery that could change physics forever. By being able to calculate the acceleration due to gravity with only a simple stopwatch, physicists around the world can now do the same. This new strategy makes calculating this acceleration with simple algebra.

Hello, my name is Harrison I am a senior, there's not to much to know about me I enjoy the outdoors, swimming and sleep. I swim for Irondequoit which peeked my interest in lifeguarding so over the summer I became a guard. The job was fun plus working outside in the summer is never a bad thing...Unless it's raining. The best part about my job, aside from sitting by a pool all day, was having the training and skills to help others in need. I am taking physics because it has always been an interest of mine, plus Mr. Fullerton is awesome so I see no reason not to take the class.

Seriously hose 22 is great!

just you wait until Mr. Fullerton reads that you think he's "super rad." you'll never hear the end of it.

Hiya Brenda, and welcome to APlusPhysics. Do you have younger siblings? They could be pseudo-pets... Bonaventure is a great school, and Olean is a fun little town -- tons of great restaurants (The Beef and Barrel is one of my all-time faves!)

Hello Rika, can't wait to enjoy physics together this year woooo!!!

Hi Hannah -- welcome to APlusPhysics! Lots of volleyball players this year -- outstanding! Back in a former life (i.e. around the time you were born) I coached down in Texas. And a uke player too -- perhaps when we get to waves you might give us a demonstration?

Hello everyone! My Name is Moritz, I am the Austrian Exchange Student. I love sports, I play Rugby for RC Danube in the U18 Pirates Team, but also do lots of other sports like Windsurfing, Mountain-biking (Downhill), Skiing, Snowboarding, Kitesurfing, Sailing and lots of other Sports at any time of the year. In Austria I go to an "Art School" where the main focus is on photographie and art. I take Physics because it is part of my Exchange Programm and I have to, but I anyway think that it is very interesting as Physics is basacally everywhere! My goal for this year is the get a better view of Physics and I would like to do a lot in the lab and learn lot's of new things

Hi, my name is Trevor, I'm a junior at IHS, and I would like to tell you about my busy and interesting life. I have a sister, Cailyn, a mother, Kim, and a father, Mike. I have many interests including, baseball, in which I play and practice for year round, being one of my most favorite hobbies on my life. Also, during the winter, I enjoy participating in Ski Club; however I only ski, not snow board. One my other hobbies are camping, in which I do with my close friends or family during the summer. Overall, you can see that my life outside of school is very packed, but cool. However, I can't forget about why I chose to take Physics this year. I chose Physics because I've heard that this science is different from any other, in that it has a little more math and hands on activities involved, which are my strengths in school. However, I also plan to take AP Physics next year because if I choose not to go into the medical field in the future, I would then want to be in the engineering field. As you can see, I have a packed, but athletic life throughout the year, and I hope it continues to be that way. -Trevor Hess

I also agree with your second paragraph, but do you remember the nerf wars we had in your backyard in Rogers! Now there's some physics for you.

Hi Peter, and welcome to APlusPhysics! Thrilled to have a guitar player in class as well (I have a piano and three guitars at home, though I like to play loud and with two little ones I don't get many opportunities to play without interruptions!) Maybe I can bring the 12-string into class in the spring when we talk about resonance and talk you into a demonstration? And I'm jealous about having goats in the backyard. Growing up in a rural area we had plenty of neighbors and friends and my brother and I always loved playing king of the hill with the goats -- fun critters when you're a kid. I don't think I could get away with having a goat here in the suburbs, though! Make it a great day...

Right, I would integrate from time t=0 to some final time t=t, so your limits of integration are 0 to t.

Hello, I got to this question and was not sure how to go about it. I sorta had an idea but that was for the line charge of a fixed length, so do I just ignore the lengths and assume that E= lamda/(4 pi e0) and then use V=int(E*dl)?

Hi, My textbook asks the question: The phase of an Electromagnetic wave at a point P at some instant is 5pi. Which of the following statements about the field vector is true? A)Both the electric and the magnetic field vectors are 0 B)The electric field is 0 and the magnetic field has its maximum magnitude C)The electric field has its maximum magnitude and the magnetic field is 0 D)Both the electric and magnetic field vectors have their max magnitudes. My question for this question is, is the textbook talking about phase difference? If so, how can the magnetic field and the electric field have a phase difference since it is originating from the same source? Thank you to all who take the time to reply to my question!

Hi Mr. Fullerton, Thank you so much for your swift response. However, I am not sure I understand what you mean in: To choose between A or D, look at the function you're using to model the waves and its value at time t=0. With a phase change of 5Pi, you'll have the opposite situation you would have at time t=0. So for a basic cosine function modeled so that the E field has a maximum value at time t=0, at the instant in time where the phase is 5Pi, it would be at a minimum (0) value, so the answer would be A. If you are modeling the wave so that the minimum value is exhibited at time t=0, you would have a maximum magnitude at phase 5Pi. How do you know that the model of a Electromagnetic wave is cosine? Also, how do you know that the mininum vector is at 0(I know this is the only option but is there a way you would know this if the minimum was not given to you)? Thank you so much for taking the time to answer my question!

The Hour of Code is simple. Just go to code.org and click the START button. Yes, it is really that simple. There are quite a few tutorials at several different levels and in several different programing languages. But the real ... View the full article

Question: Three charges are placed at the corners of an equilateral triangle with sides of length 2.0 m. The three charges at the corners of the triangle at +4.0 X 10^-6 C, +2.0 X 10^-6 C, and -4.0 10^-6 C. Determine the electric potential at the midpoint of each side of the triangle. What I have done so far: So we know that the formula for electric potential is V=kq/r. So we can just use one of the charges to find the voltage. However, the answer differs depending on which of the 2 charges(which vertices you pick) for each charge. Thank you for taking the time to answer my question.

Hi, I was wondering how a Faraday cage works. Why is that that electric fields exist outside conductors and even on the surface of conductors but the field is always perpendicular to the surface of the conductor? Also, in relation to this topic, a conductor with an excess of negative charge is in electrostatic equilibrium. Describe the field inside the conductor. What does it mean for it to be in electrostatic equilibrium. Is it just that the electrons are on the surface of the conductor? if so, wouldn't the inside of the conductor be charged positive because a lot of the negative charge is no the surface. Thank you so much for those who take the time to answer my question!

You'll do great at ANYTHING you set your mind to, I have no doubt. And thanks so much for your too-kind comments. Made my night, definitely my week, without a doubt the month, and quite possibly my year! Now to go find a tissue, I think a bug just flew into my eye and made it tear up a bit...

I'll give you some hints... First, you need to find the acceleration of the passenger as the car stops. To do this, first convert the initial speed of the car from km/hr to meters/second (http://www.aplusphysics.com/courses/regents/videos/Metric_System/Metric_System.html). Next, calculate the acceleration of the passenger: http://www.aplusphysics.com/courses/honors/videos/KinEqns_Hon/KinEqns_Hon.html Finally, once you know the passenger's acceleration, you can calculate the force using Newton's 2nd Law: http://www.aplusphysics.com/courses/honors/videos/N2Law_Regents/N2Law.html

Baking and soccer are always good interests!

My name is Danielle and I am 17 years old. I am a senior and a captain of the swim team. Outside of school, I spend time working as a lifeguard, teaching swim lessons and skiing in the winter. I wish to pursue a career in economics or photography. I am currently taking regents physics. I am taking it because I wanted to take another year of science because it looks good for college. I decided on physics because I did not want to take biology or chemistry again. I think I will really love Physics this year because Mr. Fullerton seems really nice and fun.

My name is PFowler and i am 17 years old. There is a lot to say about myself and I find that there isn't anything i can't talk about. In school, I am a hard working individual and i strive for success. I prefer to work in groups and to have a hands on enviornment so I can gain more knowledge about things and I find school fun experience. Outside of the classroom, I am many things. During my free time I play soccer and enjoy playing any sport and hanging out with friends. I am currently number 17 on the varsity soccer team and a returning player. One of the biggest things i can say about myself is that i am a proud Eagle Scout of Troop 231. I got my eagle award in the summer of 2012 and it has impacted my life in such a positive way. Problem solving skills, public speaking, and team work are all my strong suits thanks to scouting and it has made me who i am today. i am an all around great person and i have the highest respect for people and look forward to working with my peers in my classes this year. I am talikg physics because it was the next class that was put on my schedule. So far i have found that this class will be one of the more interesting and intriguing classes i will take in my high school career. I hope to learn about anything new and interesting. I don't know what Im looking for yet but i bet i will find something by the end of this class. Though i may have a rough idea for what I want to learn, i am up to the challenge of learning new things.

Nice to have you on the team Mir, and I'm happy we have a class together! Hopefully we can help eachother to succeed in this class this year

Omg Miranda!!! i hope you do good with chearleading

My name is Baillie, I am 16 years old. I have two sisters and a brother. Family is very important to me. I love to be creative and express my self, In a reasonable manner of course. I played soccer since I was 4 years old but I recently have stopped playing school soccer and focused more on working and my grades. I enjoy school, somewhat. I feel as if my grades are pretty good. Grades mean alot to me because my future means alot to me. I don't want to graduate high school, go to college, start a career, get married, have children and so on and so on. I want so much more than that, yes I want to graduate high school as well as college and have a career. But I want to travel all around the world. I am determined to make something of myself more than whats expected. I am taking physics because it was the credit I needed and I thought that it is a science that we don't really get a good enough understanding in while in junior high and other science classes. I also picked this class because I feel like I will be interested in the topics we will learn about. I hope to learn things that are surprise to me, I would rather spend my time taking a class learning about something I've never heard about and try to understand it compared to learning things I have a basic idea on. I'm really excited to gain more knowledge on a science that alot of people don't understand. I also can't wait for the hand on activities of this course.

Hi Baillie! Wow, that is an excellent reason to take Physics!! This class might push you at times but don't forget that you have a wonderful support system of Mr. Fullerton, Miss Lawson and myself to help you along this crazy journey. Have a great start to the school year!

Hey way to go on becoming an Eagle Scout. That looks so good on college applications. I think we all will learn some interesting this year. I bet we can connect everything that we think of. Like you can connect to soccer as well as your adventures with your troop. And I can connect to hockey. It will be a challenge but we can handle.

Very expensive but it looks good.

Pre-Launch Design Release ****NOTICE: We ditched our old goal of making an unmanned orbit because a spacestation in orbit is cooler****** Team Name: Kailzah Available Funds: 37426 Vehicle Name: October Sky II Vehicle Parts List and Cost: Aerodynamic Nose (680x1), Ox. 4 Photo P. (300x2), Probodoyne OKTO2 (230x1), adv. SAS mod. (1,100x1), RCS Thruster (450x3), RCS Fuel Tank FL-R25 (800x1), Inline Clamp O Tron (700x1), TR-18A Stack Decoupler (600x3), FL-T400 Fuel Tank (850x1), FL-T800 Fuel Tank (1,600x1), liquid fuel engine (475x1), Rockomax Adapter (50x1), Rockomax Jumbo 64 Fuel Tank (12500x1), Mainsaid Liquid Engine (850x1) Design Goals: We used a rather large engine in combination with two connected smaller fuel tanks and three decouplers to ensure that October Sky II makes it into orbit. Launch Goal: With this launch, we hope to put a space station into orbit around Kirbin. We hope to learn how to make a proper orbit around Kerbin (this being our first official launch). Also, we hope to use this space station in the future with our further launches. Pilot Plan: 1. Turn on SAS and go full throttle 2.) During overheat, turn down throttle to 75% 3.) Decouple and loose the first fuel tank when fuel is low/out 4.) Go full throttle and enguage RCS 5.) Turn on propgade 6.) After exiting the atmosphere, cut engine 7.) Examine orbital position & approach apopolis 8.) full throttle & widen untill path is suitable for orbit Illustrations: Safety Rep:

NO GO!!!!! Your fuel use is ridiculously high and inefficient. You will waste a ton of money on parts that will just crash back down on Kerbin because you don't have parachutes on them. And you will kill your Kerbal because there is no parachute on his cockpit. Rethink this one before launching.

How can you be sure that you will reach Mun orbit? Are you going to circularize your Kerbin orbit first or burn straight for Mun? What Time would the most reasonable launch window be to meet your goals?

Docking can be one of the more difficult maneuvers to learn when it comes to judging when the correct time to burn engines to rendezvous with target, but if you can successful it can be an efficient way of landing and knowing you still have fuel left in your drive stage to return you home. I would similarly recommend training yourself by attempting to build a small (key word there. Small) space station.

Hmm, This looks a lot like one of Scott Manley's tutorial videos. I'll be watching you brazanah Inc.

How to calculate specific heat capacity of ice.specific latent heat of vapourisation of water,specific latent heat of fusion of ice, specific heat capacity of water? How will i know you have reply?

First try finding the charge in coulombs, then convert coulombs to electrons. This mini-tutorial may help: http://www.aplusphysics.com/courses/honors/circuits/current.html So, if you use q=It, solve for q in coulombs. Then, convert q (in coulombs) to elementary charges, or electrons, using 1 electron = 1.6*10^-19 C. Does that help?

The posters around the halls and in classrooms have gained some traction and have garnered perhaps an increased awareness of the potential for STEM careers- but is it too late? I sometimes wonder if we haven't done enough to build the curiosity and "excitement" for STEM in the levels for where it matters most - in the elementary, middle and junior high levels. Some of the best experiences within science programs have been removed (Science "fairs" or long term projects that allow students to build models, test designs and collaborate with peers - outside of school have been replaced). Content coverage is an issue - instead of building the scientific practices. By the time students are in high school, the discipline silos do little to show the interconnectedness of STEM concepts, and teachers may or may not have access to the network connections that support the burgeoning interest of their students. That issue of content coverage (and even the sequence of courses) also does little to spark interest in STEM - courses become a series of isolated facts to remember.....it would be interesting to take a look at the students that participate in AP science courses - why they take what they take and when they decide to take those courses..... Now don't get me wrong -there are fantastic teachers who, even faced with the issue of coverage, bridge connections for kids and spark interest. They engage their students in complex, challenging problems and promote critical thinking skills that are necessary for success in any STEM path. I don't think that this is an issue where there is one causal factor - parents, teachers, society, higher education institutions, corporations......all need to be a part of the conversations, and then hopefully reach the same conclusion regarding the importance of STEM in order to develop a LASTING plan of action for our educational system. So, the question you pose is a relevant one. We need sustainable partnerships that can bring skill-developing, real-world challenges and problems based opportunities to our students, while supporting the heart of our disciplinary core ideas. We need a coherent, comprehensive K-12 program, where STEM never becomes an afterthought.

Hi Elliot, It does seem too easy! And I understand why you think the answer must be R, because I did too when I first read the problem. Unfortunately, it's not that easy. As the puck slides down the surface of the sphere, it accelerates both out and down. At some point, the out component of the puck's velocity becomes so great that gravity cannot keep it on the sphere. I encourage you to convince yourself of this by rolling a marble off a basketball or some other similar surface. (Rolling adds extra complexity to the problem, but the same principle applies.)

And sorry to keep adding to this... but upon further investigation - you might want to be in Pascals (does that sound farmilar lol?). That is in N/m^2 so you will need to figure out how many m^2 you have from cm^2. There are 100 cm in a m, so 10,000 cm^2 in a m^2 (100x100=10000). Divide your area given by 10,000 to find how many m^2 you have instead and then plug that number into P=F/A as the A instead of in cm^2 and you will have your answer in pascals.

not if the object accelerated until it got to 2 m/s but when it reached that point the force would have had to change to a point where it equaled the force of friction. It doesnt say anything about what happend before 2 m/s so you dont have to worry about that