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  • [查看全文]SAT II 化学考试详解(3)
    第二种题型. 对错问题 (True/false and relationship questions in Part B)在实际的SAT2考试中,这种类型的问题要求把答案写在标有化学的专用的答题纸上。第二种类型的题目从101道题目开始。每道题目的第一栏有一种表述,另一边的第二栏有另一种表述。你的首要任务是判断这些表述是否正确,并在答题纸上相应位置选择T或F;然后运用推理能力和对题目的理解判断两种表述是否存在因果关系。下面是说明和例题Part BDirections: Every question below contains two statements, Ⅰin the left-hand column and Ⅱ in the right-hand column. For each question, decide if statementⅠis true or false and if statementⅡis true or false and fill in the corresponding T or F ovals on your answer sheet. Fill in oval CE only if state Ⅱis a correct explanation of statement Ⅰ.B 部分说明:下面的每个问题包括两种表述,左栏的Ⅰ和右栏的Ⅱ。对于每一个问题,判断Ⅰ和Ⅱ的表述是否
  • [查看全文]SAT II物理考试常用术语词汇总结——M
    Magnetic flux  The dot product of the area and the magnetic field passing through it. Graphically, it is a measure of the number and length of magnetic field lines passing through that area. It is measured in Webers (Wb).  Magnification  The ratio of the size of the image produced by a mirror or lens to the size of the original object. This number is negative if the image is upside-down.  Magnitude  A property common to both vectors and scalars. In the graphical representation of a vector, the vector’s magnitude is equal to the length of the arrow.  Margin of error  The amount of error that’s possible in a given measurement.  Mass  A measurement of a body’s inertia, or resistance to being accelerated.  Mass defect  The mass difference between a nucleus and the sum of the masses of the constituent protons and neutrons....
  • [查看全文]SAT II物理考试常用术语词汇总结——N
    Neutrino  An almost massless particle of neutral charge that is released along with a beta particle in beta decay.  Neutron  A neutrally charged particle that, along with protons, constitutes the nucleus of an atom.  Neutron number  The number, N, of neutrons in an atomic nucleus.  Newton  A unit of force: 1 N is equivalent to a 1 kg · m/s2.  Newton’s First Law  An object at rest remains at rest, unless acted upon by a net force. An object in motion remains in motion, unless acted upon by a net force.  Newton’s Law of Universal Gravitation  The force of gravity, F, between two particles of mass and , separated by a distance r, has a magnitude of , where G is the gravitational constant. The force is directed along the line joining the two particles.  Newton’s Second Law  F = ma. The net force, F, acting on an...
  • [查看全文]SAT II物理考试常用术语词汇总结:O-P
    Optics  The study of the properties of visible light, i.e., the portion of the electromagnetic spectrum with wavelengths between 360 and 780 nm (1 nm = m/s).  Orbit  When an object is held in circular motion about a massive body, like a planet or a sun, due to the force of gravity, that object is said to be in orbit. Objects in orbit are in perpetual free fall, and so are therefore weightless.  Oscillation  A back-and-forth movement about an equilibrium position. Springs, pendulums, and other oscillators experience harmonic motion.  Pascals  The unit for measuring pressure. One Pascal is equal to one Newton per meter squared, 1 Pa = 1 N/m2.  Pendulum  A pendulum consists of a bob connected to a rod or rope. At small angles, a pendulum’s motion approximates simple harmonic motion as it swings back and forth without friction.  Perio...
  • [查看全文]SAT II物理考试常用术语词汇总结:Q-R
    QuarkThe building blocks of all matter, quarks are the constituent parts of protons, neutrons, and mesons.RadianA unit for measuring angles; also called a rad. 2π rad = 360o.RadiationHeat transfer via electromagnetic waves.Radioactive decayThe process by which unstable nuclei spontaneously release particles and/or energy so as to come to a more stable arrangement. The most common forms of radioactive decay are alpha decay, beta decay, and gamma decay.RadioactivityAn object is called radioactive if it undergoes radioactive decay.Radius of curvatureWith spherical mirrors, the radius of the sphere of which the mirror is a part.RarefactionAn area of high air pressure that acts as the wave trough for sound waves. The spacing between successive rarefactions is the wavelength of sound, and the number of successive areas of rarefaction that arrive at the ear per...
  • [查看全文]SAT II物理考试常用术语词汇总结——S
    ScalarA quantity that possesses a magnitude but not a direction. Mass and length are common examples.Second Law of ThermodynamicsThere are a few versions of this law. One is that heat flows spontaneously from hot to cold, but not in the reverse direction. Another is that there is no such thing as a 100% efficient heat engine. A third states that the entropy, or disorder, of a system may increase but will never decrease spontaneously.Significant digitsThe number of digits that have been accurately measured. When combining several measurements in a formula, the resulting calculation can only have as many significant digits as the measurement that has the smallest number of significant digits.Simple harmonic oscillatorAn object that moves about a stable equilibrium point and experiences a restoring force that is directly proportional to the oscillator’...
  • [查看全文]SAT II物理考试常用术语词汇总结——T
    TailIn the graphical representation of vectors, the tail of the arrow is the blunt end (the end without a point).TangentIn a right triangle, the tangent of a given angle is the length of the side opposite the angle divided by the length of the side adjacent to the triangle.TemperatureA measure of the average kinetic energy of the molecules in a system. Temperature is related to heat by the specific heat of a given substance.Tension forceThe force transmitted along a rope or cable.Thermal energyThe energy of the molecules that make up an object. It is related to heat, which is the amount of energy transferred from one object to another object that is a different temperature.Thermal equilibriumTwo materials are in thermal equilibrium if they are at the same temperature.Third Law of ThermodynamicsAn object cannot be cooled to absolute zero.Threshold fr...
  • [查看全文]SAT II物理考试常用术语词汇总结:U-Z
    Uncertainty principleA principle derived by Werner Heisenberg in 1927 that tells us that we can never know both the position and the momentum of a particle at any given time.Uniform circular motionThe motion of a body in a circular path with constant speed.Unit vectorA unit vector is a vector with length 1.Universal gas constantRepresented by R = 8.31 J/mol · K, the universal gas constant fits into the ideal gas law so as to relate temperature to the average kinetic energy of gas molecules.VectorA vector quantity, or vector, is an object possessing, and fully described by, a magnitude and a direction. Graphically a vector is depicted as an arrow with its magnitude given by the length of the arrow and its direction given by where the arrow is pointing.VelocityA vector quantity defined as the rate of change of the displacement vector with time. ...
  • [查看全文]美国高考SATII物理专题分析——Content of SAT II Physics
    美国高考SATII物理专题分析——Content of SAT II PhysicsSAT是Scholastic Aptitude Test的缩写,是申请几乎所有美国大学必须参加的考试。通常,希望继续接受高等教育的高中生需要参加SAT考试,并且SAT考试得分是获取奖学金的重要标准之一。大部分美国大学要求SAT作为录取的条件并根据SAT得分授予奖学金。Math and physics go hand in hand, right? You might be surprised, then, to learn that you aren’t allowed to use a calculator on SAT II Physics. The math required of you never goes beyond simple arithmetic and manipulation of equations. You have, on average, 48 seconds to answer each question, and the people at ETS realize that isn’t enough time to delve into problems involving simultaneous equations or complex trigonometry. They’re more interested in testing