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  • Confusing definition of proper time – which is correct?
    The time that elapses on a single clock is the proper time for that clock If a clock moves between two stationary clocks, the proper time it measures will be different from the time interval according to the readings on the two stationary clocks
  • Why is work done time taken correct over force × velocity as a . . .
    Both seem to be correct, as another answer also points out Meaning, both formulas can be used to calculate power But the fundamental definition of power is the latter, namely energy per time In this general definition, power can be calculated for mechanical systems, thermodynamic systems, electric system etc The former version includes force and might thus be harder to use in, say
  • How do we measure time? - Physics Stack Exchange
    Yes, we measure time as multiples of periodic events, such as the ticking of a clock, the rotation of the Earth, or the period of radiation from caesium, and we assume that each of those events has an unvarying duration In a thought experiment, you might imagine whether it was possible for time to expand or contract, so that, for example, a second today might actually be a different duration
  • Is my understanding of the double-slit experiment correct?
    Here is a description of the famous Tonomura double slit experiment one electron at a time The electrons leave the footprint of a particle, one at a time The accumulations of single hits from frame a at frame e show the wave nature of the accumulated electron footprints
  • Why is the time of flight of a projectile on an inclined plane equal to . . .
    For a projectile fired over horizontal ground, the time of flight is double the time taken for it to get to the highest point This time can be found by considering vertical components only - it is the same time that a projectile fired vertically upwards would take to go up and down - i e horizontal components of velocity can be ignored
  • Why does the motion of a gas never stop? - Physics Stack Exchange
    Over eons of time, the CMB is also cooling and tending towards zero Kelvin as the universe approaches heat death due to the laws of entropy The pressure of the gas will tend to zero as the age of the universe tends to infinity
  • Why is momentum defined as mass times velocity?
    18 At the time Newton and Leibniz were working, both were trying to understand what was happening when mechanical systems changed speeds as a result of forces, that is, trying to find models that would fit with the observations As a general rule, when trying to understand a novel system, identifying an invariant is tremendously useful
  • How exactly does energy transformation take place?
    But how does that happen exactly? Am I correct in assuming that it is different in every case? For instance, if chemical energy is being transformed into mechanical energy in the body, it has to be different than when electrical energy is being transformed into light in a light bulb
  • Time dilation in Einsteins train example (lightning strike)
    In your first paragraph, you assume that for an observer on the platform, the two lightning strikes are simultaneous --- that is, the time difference between them is zero In your second, you say that you expect that for an observer on the platform, the time difference between them is longer than it is for an observer on the train, which means in particular that the time difference is not zero
  • Was Aristotle Actually Correct About Gravitation? [duplicate]
    Well, it suddenly occurred to me this morning that Aristotle was actually correct, and Galileo's experiment was incapable of discerning any difference in arrival times between the two weights he dropped





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