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goalkeeper0

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Everything posted by goalkeeper0

  1. This sounds like a good chemistry topic for our current unit on intermolecular forces
  2. Oh..I am definitely going to use MathType in the future. Thanks for the recommendation!
  3. Yup, I am in agreement that the Moon Boots are pretty awesome.
  4. I remember this from last year!
  5. Obvious connections between Physics and Calculus, or Physics and Chemistry exist. However, what about Physics and Humanities? Recently, in Humanities class, we continued our Middle Ages unit with a lesson on medieval architecture. We focused on the Gothic Cathedrals built in the Middle Ages, and the advances in architecture which were necessary to build such tall structures. The first major advance was the transition from the rounded arch to the pointed arch. The pointed arch distributed the force of the ceiling and walls down toward the ground, and a bit outward. The old, Romanesque, rounded arch focused too much force outward as the columns grew taller. With the rounded arch, as the columns grew taller, the top of the arch would bow under the extreme force. And, as one arch bowed, the entire cathedral would begin to crack and crumble. As the pointed arch minimized the outward force, the outward force still existed. So, flying buttresses were created as supports for the arches. These supports connected to the arches about where the columns began and the arch ended. The point of connection was very important, because if the buttress was placed too low, the arch would still bow, and collapse. With the flying buttresses, walls could be supported from the outside; and, the force of the walls was aimed even more downward. The flying buttresses allowed the cathedrals to remain in equilibrium, balancing out all forces. And, what was the result of these advances?...................Cathedrals over 48 meters tall!
  6. Don't let four-wheel drive fool you, because any car can spin out on icy, snowy turns. In wintry weather, drivers must slow down or shovel their way out of a snow bank. Why must drivers slow down? The coefficient of friction between rubber tires and snow is much less than the coefficient of friction between rubber tires and dry pavement. The coefficient of friction between pavement and tires is about 1.00; whereas, the coefficient of friction between snow and tires is about 0.30. So, how much must a person really slow down while driving around a banked turn? vmax=(urg)1/2 r= radius of turn, u= coefficient of friction, g=9.81m/s2 vmaxpavement=(1.00 x 10.0m x 9.81m/s2)1/2= 9.9m/s=22.1mph vmaxsnow=(0.30 x 10.0m x 9.81m/s2)1/2= 5.4m/s=12.1mph Physics proves you must slow down!
  7. I remember that balloon It made me smile.
  8. What are oscillations equations without gravitation equations? Gravitation: T12/R13=T22/R23 G= 6.67x10-11 g=Gm/r2 Fg= -Gm1m2/r2 Potential Energy= -Gm1m2/r Vorbit= [Gm1/R]1/2 Vescape= [2Gm1/R]1/2 T=(2(pi)R)/v Total energy for a circular orbit= (-Gm1m2)/(2R) Total energy for elliptical orbit= (-Gm1m2)/(2a) ; a= major axis radius Velocity/Radius relationship for elliptical orbits: vprp=vara Overall, there aren't too many equations to remember for this topic. But, all of the equations are very similar. So, memorize!
  9. While some are contemplating the end of the world, I am studying for physics. Here are the essential oscillations equations to know for our test tomorrow. Oscillations (Includes SHM, Springs, Pendulums): F=-kx xmax=A vmax=Aw amax=Aw2 T=1/f and f=1/T w=angular frequency=2(pi)f=2(pi)/T v=wr Potential Energy= (1/2)kA2cos2(wt) Kinetic Energy= (1/2)kA2sin2(wt) Total Energy= (1/2)kA2 x(t)= Acos(wt + phase shift) v(t)= Awsin(wt + phase shift) a(t)= -Aw2cos(wt + phase shift) Tspring= 2(pi)[m/k]1/2 For use with pendulums only: Tpendulum= 2(pi)[L/g]1/2 w=[(mgL)/(Ip)]1/2 w=[g/L]1/2 Also, from past units, the torque equations are handy, along with the moment of inertia equations. STUDY!!!
  10. Around the holidays, people typically gain weight as cookies, candy canes, and other treats are around every corner. But, this Christmas, you can lose weight! Without a diet, and without exercise, there is one answer to the essential question: "How can I lose weight?" Simple. Go to the moon. Here is the calculation to prove this solution really works! 1) Find g: g=[G(mass of moon)]/[(radius of moon)^2] g=[6.67x10^(-11) x 7.35x10^22]/[(1737000 m)^2] g=1.62 m/s^2 2) Convert your weight from lbs to kg 130lbs=59 kg 3) Weight (N)=mg Weight = 59 kg (1.62 m/s^2) Weight on the moon= 95.58 N So, what do these results mean? Your weight loss can be measured in Newtons as you went from about 579N to about 96N. Or, in lbs, you went from 130lbs to about 22lbs! On the moon, you weigh approximately 17% of your weight on the earth.
  11. As we are in our second independent unit, I thought I little review picture couldn't hurt. Remember: 1.) Max acceleration is achieved when the spring is at -amplitude or +amplitude. 2.) Max velocity is achieved at equilibrium. And, along with this, we must know: KE= (1/2)kA2sin2(wt) w= angular frequency, k= spring constant, A= amplitude, t= time PE= (1/2)kA2cos2(wt) These equations are useful when finding the Potential or Kinetic Energy at time, t, in the oscillation.
  12. Every high school student treasures his or her first college letter in the mail. However, when the letters begin to consume your recycle bin, they become overwhelming. Each letter seems to advertise the same things: a nice campus, low student:teacher ratio, updated infrastructure, and groundbreaking research. So, when something different comes in the mail, it is exciting. Recently, I received a letter from the University of Akron advertising their Corrosion Engineering major, which is not offered anywhere else. As many of us taking AP Physics C intend to become engineers or scientists, I thought you may be interested in learning about Corrosion Engineering. *Corrosion engineers learn how to reduce the costs or corrosion, and design structures (roads, bridges, etc.) for greater performance and safety. *Currently, corrosion costs the US around $400 billion a year. Rusty columns, bridges, and pipelines are threats to society. Corrosion engineers work to improve public safety by assessing the damage done by corrosion, and slowing down the process of corrosion. *Corrosion engineering blends together chemical, electrical, civil, environmental, and mechanical engineering. *The demand for corrosion engineers is extremely high, as the US infrastructure continues to age. *Both the government and industries have donated large sums of money to this program at the University of Akron. Recently, BP donated $500,000. The major is up-and-coming. This is just a brief description of corrosion engineering. Overall, it seems like a great major if multiple branches of engineering interest you. Also, the job stability is tremendous as the instability of US infrastructure increases. If you want to learn more visit http://www.uakron.edu/corrosion/academics/curriculum.dot.
  13. This is so cute..I love the names
  14. As Thanksgiving is just around the corner, retail stores are bombarding consumers with Black Friday ads. The ads show glittery, appealing products at low-prices. But, what the ads do not show--crowded parking lots, irritated customers, and stampedes-- you must watch out for. To minimize your risk of injury, here is some physics advice if you are one of the bold buyers who battles Black Friday crowds. 1) Attempt to maximize your power (force dotted with velocity) beforehand. A balance of force and velocity is necessary. Do not bulk up, because your velocity will suffer, and you will be at the back of the crowd. However, if you are relatively mass-less, but fast, you will also be at the back of the crowd. 2) Bring along a friend! With a friend to help carry your purchases, more work can be done. As work is force dotted with displacement, lifting heavy boxes, pushing televisions, etc. will be much easier with the help of an assistant. 3) Avoid stores where a wide waiting area slims down to a narrow entry. Why? Conservation of flow rate. Flow rate= Area of space for people x velocity of the crowd. Therefore, when people head toward the doors, the velocity of the crowd must increase as the Area of the space decreases, to conserve flow rate. This means that as you approach the door of the store, the speed at which people are "flowing" increases. This is how many stampedes occur. All in all, if you do venture outside in the wee hours of the morning, fuel up! Eat healthy foods beforehand to give your body the necessary potential for success.:eagerness:
  15. goalkeeper0

    Car Crash!

    11.2 mph...good to know. I wonder how much this value would change for different sized cars.
  16. The class atom costume is definietely the best.
  17. Or just make really really hot coffee...and everything will work out
  18. What do you want to research?
  19. This brings back wonderful memories about AP Bio
  20. I forget where exactly I saw this, but I heard that some engineers created a solution to road pot-holes with a non-newtonian fluid such as this. They put the fluid in bags, and put a bag or two inside a pot-hole. Without pressure, the fluid in the bags formed to the shape of the pot-hole. Then, when cars drove over the patch, the substance hardened. I thought this was pretty cool.
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