bdavis

I wholeheartedly agree with you my friend. I think it is safe to say that these units are very humbling and it shows that there are so many complex things that are so interesting yet so difficult to understand. Study study study time!

I want one!

I think she is naked

I had to yell at all of you to shut it while i was working! seriously not cool guys!

I agree with both of you. Taking the initiative in these units is difficult and we need a swift kick in the behind.

is she naked?

I did one too! great minds think alike!

hahahahahahahahahaha your avatar is funny

Mr. Dragon, even in your fatigued state you managed to bust out one heck of a blog post!

We are now entering our last quarter as seniors in high school. I want to rebound from an uncharacteristically bad academic performance in the third quarter and finish strong in the last quarter. This is now a prime time to start reviewing for the AP test that is looming in the very near future. I for one am quite a bit nervous but I have a plan to follow that will get me prepared for the day of the test: 1. do 1 blog post a week 2. Read text book a little bit each night 3. do webassigns a little bit each night 4. Read in my review book a little bit each night, reviewing previous units. 5. get sleep 6. eat a bagel with peanut butter everyday (got that one!) If I do this and take the initiative to begin studying now, I will be able to properly locate my weaknesses, other than the ones I already identified, and I will work to improve them for the day of the test. I will be prepared when I walk in there that fateful day in may. I guarantee i won't look like this: and if my pants are down, it will be out of my own accord!

In both physics and chemistry, u, stands for a lot of things. u is the coefficient of friction, with subscripts indicating kinetic or static friction. It is the permeability of free space. It represents a magnetic moment. It indicates a micro unit (10^-6). It represents linear density. In chemistry, it represents velocity. u is also used to represent values in music, pharmaceutical sciences, computer science, software design, meat science and linguistics. Understanding each and every representation of u can be very difficult and many of the values produced do not require units so to an untrained eye, the value of u could mean many different things. Thus it could be interpreted in the wrong way. There are many other Greek letters that can be used to represent values in all fields of study so instead of overusing u, other unused Greek letters should be incorporated. As a student who has to discern between five different representations of u, it becomes difficult at times if the topic at hand isn't 100% clear. So i believe u shouldn't be used as much and other Greek symbols should be incorporated into these diverse fields of study.

F=qVXB F=ILXB Motion of Point Charges: A particle of mass m and charge q moving with speed v in a plane perpendicular to a uniform magnetic field moves in a circular orbit. The period and frequency of this circular motion are independent of the radius of the orbit and of the speed of the particle. Newton's 2nd law: qvB=m((v^2)/r) Cyclotron period: T= 2(pi)m/(qB) Cyclotron Frequency: f= 1/T = (qB)/(2(pi)m) Velocity Selector: consists of corssed electric and magnetic fields so that the electric and magnetic forces balance for a partivle moving with speed v. E=vB Mass Spectrometer: The mass-to-charge ratio of an ion of known speed can be determined by measuring the radius of the circular path taken by the ion in a known magnetic field. Magnetic dipole moment: u= NIAn Torque= t= u x B Potential energy of a magnetic dipole: U= -u . B Net force on a current loop in a uniform magnetic field is 0. Biot Savart Law: B= (u_0)Lxr/(4(pi)r^2) Magnetic field lines: the magnetic field is indicated by lines parallel to B at any point whose density is proportional to the magnitude of N. Magnetic lines do not begin or end at any point in space. Instead, they form continuous loops. Gauss's Law for magnetism: Net flux= integral over the closed surface( BdA)= 0 Ampere's Law: Integral over the closed surface (B . dl)= (u_0)I_perm These are the main and basic laws and concepts of magnetism. Other equations can be derived for different objects with current flowing through them and deriving them helps to gain a better understanding of the relationships between different objects and their magnetic fields when current is induced.

As a baseball player well below average height, I need to maximize every aspect of my game to be the best player I can possibly be. One aspect I have tirelessly worked on is my arm strength and throwing mechanics in order to maximize the velocity of throwing a baseball. Velocity is equal to displacement divided by time. Therefore, if there was more displacement over the same period of time, the velocity would be greater. I throw over the top which means that i have more of a windmill throwing motion rather than having a lower trajectory. There is virtually no time difference between the beginning of my throwing motion to when i release it at a 3/4 arm angle (a lower trajectory) or over the top. But by throwing over the top, my arm travels a little bit further and is therefore displaced more. If I apply that same force over the longer displacement during the same time span, then the resulting velocity of the ball when I release it will be greater from my over-the-top motion rather than a 3/4 motion. So I am trying to maximize every part of my game so I make the best of each day of baseball. So basically what I am saying is... come out to support the baseball team! The first game is home against Greece Athena at 4:30pm! Be there!

At the beginning of the school year, we learned the two forms of vector multiplication: the dot product and the cross product. The more intricate of the two, the cross product, comes into play in many equations to provide very useful information. For example, in magnetism, F=I(BXL). This means the magnetic force is a vector cross product of the vector of the magnetic field crossed with the length of the object multiplied by the current flowing through that object. The resulting force will have values in the X, Y, and Z directions, indicating which plane the force is in relative to the length and the magnetic field. The Cross product is very helpful in revealing the direction and magnitude of the vector in that direction. It also helps to visualize where the other vectors (that influence the value of the resultant vector) are and what direction they are traveling in. Unlike most of my classmates, I like the cross product and although I don't have a firm understanding of it yet, I will continue to work on it so I can use it to better understand physics concepts as I take higher level physics courses.

du= -F(dl) dv=(du/q) dv=(-E)(dl) delta V= -integral (E)(dl) U=qV 1eV=1.6X10^-19 U=K(q1)(Q2)/r V=KQ/Square root((x^2) + a^2)) (V=0 at abs(X) = infinity For a spherical shell of charge: V= KQ/r, r>R (V=0 at r=infinity) V=KQ/R r For an infinite line charge V= 2k(lamda)ln(R_ref/R) for (V=0 at r=R_ref) Charge on a Nonspherical conductor: On a conductor of arbitraty shape, the surface charge density, (sigma), is greatest at points where the radius of curvature is smallest. Dielectric Breakdown: The amount of charge that can be placed on a conductor is limited by the fact that molecules of the surrounding medium undergo dielectric breakdown at very high electric fields, causing the medium to become a conductor. Dielectric Strength: The dielectric strength is the magnitude of the electric field at which dielectric breakdown occurs. The dielectric strength of air is E_max = 3 x 10^6 V/m = 3MV/m Not all of the equations are listed because some are required to be derived as parts on the AP test so by knowing the basic relationships and equations, deriving the rest of them become understandable and simple.

What our dear friend charles merie eckert never mentioned in his series of swimming blog posts was the difference between a cannonball and an actual dive. When asked to visually show another person the difference between a cannonball and a dive, virtually anyone can demonstrate that. But when asked to explain what makes a cannon ball produce a bigger splash than a dive, few people can provide a sufficient response. The reason a cannonball produces a bigger splash than a dive is a greater amount of surface area of a person exposed when he/she hits the water. If the same person jumps off the board with an equal force and reaches the same height, that person will reach the surface of the water with the same acceleration and therefore the same force. But the cannonball causes that same force to be spread over a greater surface area. Therefore the greater amount of water affected by the force will exert an equal force, according to Newton's third law, which produces the splash. In a dive, that force is more concentrated over a smaller area therefore making the resulting splash smaller due to the smaller area affected by the applied force. Now Charles is going to say "well swimming and diving are two different things." He may be right in the technical sense but here we are physicists and that information provides no significant value to what i am explaining. So yes that is the technical explanation as to why a dive is different than a cannonball.

In the dating world, people with opposite personality types seem to be attracted to each other. In the world of electrostatics and magnetism, opposite charges attract each other and opposite magnetic poles attract each other too. Particles with a positive charge, such as a positive test charge, are attracted to particles with a negative charge, such as a negative test charge. The particle with the greater magnitude of charge will attract the other with a greater force. For example, if a particle with positive charge has 2C of charge and a particle with negative charge has 1C of charge, then the particle with a postitive charge will exert a greater attractive force on the particle with negative charge than the attractive force the negative particle will exert on the positive particle. With magnets, the Northern end is attracted to the south end due to opposite magnetic poles. These properties play a very large role in understanding the subatomic relationships between particles of different charge and magnetic polarity in substances such as blood and water. These phenomena occur ever instantaneous moment of everyday!

Here are some of the necessary equations, values, and laws that one must memorize or quickly derive in order to achieve success on the AP-Physics C E & M exam: K=(1/(4(pi)(epsilon not))) F=(K(q1)(q2))/(r^2) E=F/q E=(Kq)/(r^2) E=(K/r^2)(integral from v to infinity of dq) Gauss's Law: Net flux= integral over the closed surface of EdA = Q/(epsilon not) V=w/q V=Kq/r e=1.6X10^-19 C a= (qE)/m Coulomb's Law: The force exerted by one point charge on another acts along the line between the charges. It varies inversely as the square of the distance separating the charges and is proportional to the product of the charges. The force is repulsive if the charges have the same sign and attractive if the charges have opposite signs. Rules for Electric Fields: 1. Electric field lines begin on positive charges (or at infinity) and end on negative charges (or at infinity). 2. The lines are drawn uniformly spaced entering or leaving an isolated point charge. 3. The number of lines leaving a positive charge or entering a negative charge is proportional to the magnitude of the charge. 4. The density of the lines (the number of lines per unit area perpendicular to the lines) at any point is proportional to the magnitude of the field at that point. 5. At large distances from a system of charges with a net charge, the field lines are equally spaced and radial, as if they came from a single point charge equal to the net charge of the system. 6. Field lines do not cross. (If two field lines crossed, that would indicate two directions for E at the point of intersection.) Depending on the conductor, if it is a shell, solid or hollow, different values of E will be obtained by the properties of the conductor and the radius given in the problem. That is the condensed version of the necessary things to know for electrostatics.

Well I started this third quarter off on a really bad foot when i got an atrocious test grade on the electric potential test. We followed that test with an independent unit in circuits and although my test grade in that unit wasn't anything special, it was a significant improvement. Then we got the magnetism independent unit. In AP-physics B, my understanding of the magnetism unit wasn't very strong but I felt like i had a better grasp of it by the end of last year. However, with an increase in difficulty of the problems and more complex concepts with magnetic monopoles, my mind was blown. I like the freedom we get with the independent units but with freedom comes great responsibility to get it done promptly. I envy my classmates who had took the initiative and got the unit done on time with a better understanding because that is what I should have done. Learning on my own, structuring my schedual, and managing my time is something I must improve as I move on towards higher education.

wwwwwwwwwwwwwoooooooooooooooooowwwwwwwwwwwwww!!!!!!!!!!!! you know, that is probably why i am really bad at frisbee. i don't take into account the pressure. i need practice!

Hey mr. muffin man,... you forgot a few equations

if this doesn't work, i am blaming you

i love you

You must have had a creative trip to the bathroom. I guess that is only common in panthers when they come out before midnight .

Hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha phew! oh god that was good. well i can tell you one thing: better watch out come baseball season because i have been working out the shoulder. when i simultaneously create a vacuum and a fireball we should alert the news!