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Solving Slope Problems - MCAT
2008-01-13 21:47:00 Solving slope problems. Let’s start simply with a frictionless inclined plane and build from there, since the steps are largely the same for any block on an inclined plane like the one pictured here: Getting the forces, probably the hardest part The first part of solving an inclined plane problem is figuring out all of the forces ... More About: Problems
Acceleration, Speed, and Velocity - MCAT
2008-01-12 21:45:00 SPEED vs VELOCITY As far as speed is concerned, remember that speed is a scalar (just a number) and velocity is a vector (a number and a direction). You could come up with a situation where there is no change in speed but a change in velocity. That situation would be a particle moving in a ... More About: Speed , Acceleration
Coulomb?s Law - MCAT
2008-01-11 21:40:00 Coulomb’s Law describes what happens when two charges are placed close to one another. The magnitude of the force between the two charges, called the electrostatic force, depends on two variables: the magnitudes of the two charges, and the distance between the two charges. Whether the force is attractive or repulsive depends on the signs ...
Pendulums and Springs: Tension - MCAT
2008-01-10 21:38:00 It may be counterintuitive, but in a pendulum, the tension in the string during an oscillation is larger than mg. Here is an example to explain why this is so. Imagine for a moment that you are looking at a weight on a string that’s bouncing, and imagine that you are also looking at a ... More About: Tension
Neurotransmission from a Physics Perspective
2008-01-09 21:37:00 QofQuimica: You may recall from your neurobiology lessons that the axons of neurons are myelinated, and that myelin speeds the transmission of action potentials. However, you may not have ever thought about why this is true. This post explains an application of neurotransmission concepts to biology (cell membranes). So for all of you who are ... More About: Physics , Perspective , Missi
Conversion units - Physics MCAT
2008-01-08 21:35:00 Some people still have problems converting cm^3 and mm^3 to m^3 for problems such as density and volume. 1) When converting from cm^3 to m^3 move 6 decimal places to the left. For example if the volume of a box is 120 cm^3, then converting it, we will get .000120 m^3 or 1.2 x 10^-4 m^3 2) ... More About: Physics , Conversion , Units , Unit
Mechanical advantage - simple machines - MCAT
2008-01-07 21:31:00 Recent MCATs have included several questions about simple machines — devices that alter the strength of the input force and the distance through which force is applied. You should be familiar with the force multiplication concept, and somewhat familiar with some of the machines that use it. The basic concept is this: you can change force, ... More About: Machines , Simple , Mechanical , Advanta
Physics - I keep messing up my conversion factors! - MCAT
2008-01-06 14:21:00 The only conversion you will have to do is of prefixes, e.g., micro-whatsis to kilo-whatsis. No kilograms to slugs, or liters to hogsheads, or meters to chains, or… For those who have trouble converting units, I suggest the following method: First, forget the conversion factors listed in whatever reference material you’re using. They’re correct, of course, but if you’re having trouble they’re what’re mixing you up. Instead, just think in terms of big and small, as shown here. Also, eschew multiplying by negative exponents — divide instead. Finally, think of the units as variables, and cancel as you would with variables. An example problem will show the method best. Lets say you want to know the speed of light, c = 3×10^8 m/s, but in cm/ms. Write down 3×10^8 m/s on the left. Write down the units you want, cm/ms, on the right. Now multiple and divide to get rid of the m and the s, and to get cm and ms in the right spots: Code: ... More About: Physics , Conversion , Mess
How do I do buoyancy problems? - MCAT
2008-01-05 14:18:00 First, you must understand this principle: the buoyant force, which is directed upward, is equal by definition to the weight of the fluid displaced. Problem type 1: the object is floating, in equilibrium, on the surface of a fluid. If the density of the fluid above the surface can be neglected (i.e., it’s much lighter than the ... More About: Problems
What constants should I know for physics? - MCAT
2008-01-04 14:16:00 Not many. And those you need, you do not need with much precision at all. pi = 3 (Not kidding; this should be good enough. 3.1 in a pinch) sin(30) = 0.5; cos(30) = 0.9 sin(45) = 0.7; cos(45) = 0.7 sin(60) = 0.9; cos(60) = 0.5 the speed of light in a vacuum (and air): c = ... More About: Physics
Centripetal and Centrifugal Forces - Mcat
2008-01-03 14:12:00 Xanthines: Here is an explanation of centripetal force, using the example of your car making donuts in a level parking lot. In this case, the engine is providing the power for forward motion (by forward, I mean the direction of motion of the front of the car). The centripetal force equation Fc=(m)(v^2)/r describes the force ... More About: Forces
Physics Equations ?Light and Optics? MCAT
2008-01-02 14:10:00 Light and Optics Index of refraction n = c/v **Compares the speed of light in a vacuum with the speed of light through a given medium** angle of refraction — Snell’s Law n1sin(theta) = n2sin(theta) E = hf **this equation shows the higher the freqeuncies of light have more energy** More About: Physics , Light , Quat
Physics Equations ?circuits? MCAT
2008-01-01 14:04:00 circuits Voltage = IR (Ohm’s Law) R = resistance I = current Capacitance = Q / V Q = CV Q = charge V = voltage **Capacitance is the ability to store charge per unit voltage** The energy stored within a capacitor can be found using these equations: U = .5(QV) U = .5(C)(V^2) U ... More About: Physics , Circuits , Quat
Physics Equations ?Electricity? MCAT
2007-12-31 14:02:00 Electricity F = (k)(q1)(q2) / ( r^2) **Coulomb’s Law — remember that opposite charges attract each other and like charges repel each other** Electric Field’s due to a point charge The electric field that exists at a point in space is the electrostatic force felt by a test charge at the point divided by the charge itself E = (force) ... More About: Physics , Electricity , Quat
Physics Equations ?Waves? Mcat
2007-12-30 13:58:00 Waves V(wave) = (frequency)(wavelength) **frequency is measured in hertz or cycles/second** The period of a wave is the time required for one up and down cycle: On an x-axis of time, it is the point from any point of the wave function, to that exact point where the wave function has repeated itself **T = (1/frequency)** Intensity Is measured in decibels ... More About: Physics , Waves , Quat
Physics Equations ?Solids? - MCAT
2007-12-29 13:57:00 Solids — Included for completeness; DO NOT LEARN THESE! [according to Shrike] Stress = (Force) / (area) — Stress is what is done to an object **The maximum stress applied to an object that allows the object to regain its original dimensions is called the yield point — beyond this point, an object will not regain its ... More About: Physics , Soli , Quat
Physics equations - MCAT
2007-12-28 13:51:00 These are some common Physics equations that will probably need to be memorized and understood for the MCAT vectors Pythagorean Theorem: a^2 + b^2 = c^2 **Remember the common 3-4-5 and 5-12-13 triangles** sin(theta) = (opposite / hypotenuse) cos(theta) = (adjacent / hypotenuse) tan(theta) = (opposite / adjacent) Distance, Displacement, Velocity, and Acceleration Displacement d = change in position Speed = (distance) / (time) Velocity ... More About: Quat
Newton?s Third Law - Mcat
2007-12-27 13:49:00 In the classes I teach, a disconcerting number of students don’t really understand Newton ’s third law of motion and get confused by the statement: "For every action, there is an equal and opposite reaction." In fact, the law would be more accurately expressed this way: "For every force, there is an equal and opposite force." Or, in mathematical terms: "F1 ...
How much time should I spend reading the passage? - Physics Mcat
2007-12-26 13:46:00 None. Or very close to none. Time is of the essence on the Physical Sciences section; nearly everyone needs to finsh the section, but for most people that isn’t going to happen if they spend too much time reading unnecessary material. And it turns out that most of the text in physics passage is unnecessary ... More About: Reading , Physics
Right Hand Rule - Mcat
2007-12-25 13:43:00 This is everything you need to know about the Right Hand Rule (RHR), or rather the two versions thereof. One or the other of them applies any time you are finding a direction (whether of field, force, acceleration, or even something else), and charges are moving. I detail the flat hand method — no sticking fingers ...
Ropes, cables, wires, and strings on the mcat
2007-12-24 13:42:00 On the MCAT: Rope s, cables, wires, and strings are just ways to apply forces (except when they’re vibrating…). The force on a rope etc. is always applied along the line of the rope, and it is the same in both directions. It is equal to, by definition, the tension on the rope. The amount of force, i.e., the ... More About: Cables , Strings
Weightlessness
2007-12-23 13:41:00 Shrike: Weigh t is defined as the force of gravity on an object, and always equals mg. In popular parlance, an object is "weightless" when its apparent weight is zero. Apparent weight is just what a scale would read if the object were sitting on it; i.e., it’s the force exterted on it, in an ...
What are the kinds of waves, and in what materials do they appear?
2007-12-22 13:37:00 There are two kinds of waves, longitudinal and transverse. Longitudinal waves are waves that vibrate in the same direction that they travel (propagate). Transverse waves vibrate across their direction of travel. Every physical material — solid, liquid, and gas — can conduct a longitudinal wave — that’s a compression wave, also known as sound (though often ... More About: Materials , Waves
What are the conservation laws, and when do they apply?
2007-12-21 13:35:00 In theory, momentum is always conserved, regardless of what happens. On MCAT problems, momentum is conserved if the system, i.e., all the objects that are mentioned, includes everything that exerts force on anything else. The most common trouble here is the Earth — if gravity causes objects to fall, but the Earth is not mentioned ... More About: Laws , Conservation , The Con
How do I solve MCAT optics problems?
2007-12-20 13:32:00 The easiest way to solve MCAT optics problems — all of them — is to know three equations (which must be memorized): 1/o + 1/i = 1/f m = -i/o p = 1/f … nine easy definitions (try them; you already know most of them): o = distance (from the lens/mirror) to the object i = distance to the image f = ... More About: Problems
Physics - Solving Trig Functions without a Calculator
2007-12-19 13:32:00 The good news is that you don’t have to be able to do this on actual MCAT questions. All you would need to be able to do at the very most on a problem is to estimate where your trig function value will fall with relation to the five angles that you know. (You should ... More About: Physics , Calculator , Functions
IELTS Test centers in THAILAND
2007-10-17 13:12:00 Address Contact Australia Centre Chiang Mai - Test Centre IELTS Administrator 75/1 Moo14 A. Suthep T. Muang ... More About: Thailand
The Day of the Test - Preparation for the IELTS Test
2007-10-11 10:27:00 There are no magic formulas for doing well in the IELTS test. However, these simple Jugge’stions will help you do as well as possible. Be calm even if you feel depressed or discouraged. As one part of the exam finishes, forget it and go on to the next one. Do Not Memorise Answers. Firstly, an examiner can ... More About: Test , Preparation , Prep
Stay Calm - IELTS test
2007-10-10 10:26:00 Two further comments should be made. 1. While it is important that you study hard, you also need rest, exercise and relaxation. Without these things, you will grow tired, you may lose interest in your study, and your health may suffer. You will prepare best for the exam by living a balanced lifestyle. 2. Many people get ... More About: Test , Stay , Calm
to hear, read, write and speak as much English as possible
More articles from this author:2007-10-09 10:24:00 You will also find it useful to do other study apart from class review: extra work on thii that you find difficult. Also, you simply need to hear, read, write and speak as much English as possible. Here I some suggestions: Ø do an adult education course; Ø join a social club, or a community service organisation; Ø use ... More About: Write , Hear , Read , Speak 1, 2, 3, 4, 5, 6, 7 |
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