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a. 健康的,卫生的,Hygeia女神的



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  • Why Acceleration is Always Squared | Newbie Question Answered
    If your car accelerated at 10 meters per second per second, then the needle would just move up 10 meters per second on the dial every second Instead of saying "meters per second per second" we generally say "meters per second squared" (m s^2 instead of m s s)
  • What does per second per second mean? - Physics Forums
    So, the acceleration will be 32*(224,000 900,000), which is equal to 7 96 feet per second per second (note: the 32 is simply because of our choice of units here - if we were using the metric system, with force in Newtons and mass in kilograms, then the acceleration in meters per second squared would simply be the force divided by the mass
  • Why is the SI unit for acceleration m (s^2)? - Physics Forums
    Why is the SI unit for acceleration \\frac{m}{s^2}(meters per second squared) when it is actually \\frac{m}{\\frac{s}{s}} (meters per second per second) Isn't the part concerning the seconds different? Wouldn't this give you different answers sometimes, or does that usually never get in the way
  • Maximizing Speed: Solving for the Maximum Speed of a Moving Particle
    The instantaneous speed of a particle moving along one straight line is v(t) = ate-3t, where the speed v is measured in meters per second, the time t is measured in seconds, and the magnitude of the constant a is measured in meters per second squared What is its maximum speed, expressed as a multiple of a? (Do not include units in your answer )
  • What is the concept of per second per second? Like acceleration?
    My brother tells a funny story about how when he first saw the phrase 10 meters per second per second he thought it was a typo I've found it helps some people to understand if you use different words So an acceleration of 10 meters per second^2 means you velocity changes by 10 meters per second each second Or think of an acceleration of (5
  • Exercise: position vector of a particle - Physics Forums
    The acceleration of a particle moving only on a horizontal xy plane is given by a = 3ti + 4tj, where a is in meters per second squared and t is in seconds At t = 0, the position vector r = (20 0 m)i + (40 0 m)j locates the particle, which then has the velocity vector v = (5 00m s)i + (2 00m s)j
  • What Does Time Squared Really Mean in Physics? - Physics Forums
    If a unit like "meters sec" appears in many physical applications with the same interpretation (velocity) then people are tempted to say that "meters sec" must mean velocity However, this is not the case For example, suppose you have a machine where the operator pushes the machine y meters When the pushing stops, the machine runs for x seconds
  • Summing forces: finding acceleration and F_n - Physics Forums
    Express your answers, separated by a comma, in meters per second squared and Newtons to three significant figures Homework Equations ΣFx = Fpcosθ−Fk = m * a_x ΣFy = FN−FG−Fpsinθ =m * a_y The Attempt at a Solution a_x
  • Understanding m^2 s^2 (Speed of Light help) - Physics Forums
    Google says the speed of light squared is 8 98755179 × 10 16 m2 s2 Can someone give this to me in meters per second please Can someone give this to me in meters per second please Science news on Phys org
  • Converting Meters per Second Squared to Kilometers per Hour Squared
    Converting Meters per Second Squared to Kilometers per Hour Squared Units to Meters Dec 5, 2018;





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