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SAT2物理词汇术语整理24

2019-10-03 13:12:45来源:网络

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  The following list defines all of the bold-faced words you encountered as you read this book.

  S

  Scalar

  A quantity that possesses a magnitude but not a direction. Mass and length are common examples.

  Second Law of Thermodynamics

  There 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 digits

  The 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 oscillator

  An object that moves about a stable equilibrium point and experiences a restoring force that is directly proportional to the oscillator’s displacement.

  Sine

  In a right triangle, the sine of a given angle is the length of the side opposite the angle divided by the length of the hypotenuse.

  Snell’s Law

  Relates the angle of incidence to the angle of refraction: .

  Sound

  Waves carried by variations in air pressure. The speed of sound waves in air at room temperature and pressure is roughly 343 m/s.

  Specific heat

  The amount of heat of a material required to raise the temperature of either one kilogram or one gram of that material by one degree Celsius. Different units may be used depending on whether specific heat is measured in s of grams or kilograms, and joules or calories.

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