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  1. Passionate Eng

    I Reference for measuring the speed of of light

    (Sorry, my questions may look irrelevant but complete my thoughts) So, every moving object has its own time frame which appears to move slower than every other time frame. i.e. there is no absolute point in time. So, which frame do we refer to when we say that the universe is 14 billion years old?
  2. Passionate Eng

    I Reference for measuring the speed of of light

    Thanks! I will read about the relativity of simultaneity as soon as I can. I have another question just crossed my mind. If I am moving fast and I have a mechanical or digital clock, will they TIK TOK more rapidly? If so, Why?
  3. Passionate Eng

    I Reference for measuring the speed of of light

    I don't know what's the appropriate title for my question but here it is: What's the reference we consider to measure the speed with respect to when we say that as the speed of a moving object approaches the speed of light the time becomes slower in the frame of this moving object.
  4. Passionate Eng

    I Resonant frequency of small particles

    Hi How can find the resonant frequency of small objects like dust particles? What factors affect the resonant frequency? And is resonant frequency dependent on size? i.e. if the resonant frequency of 1 cm3 of glass is some certain value, would it be the same for a larger size?
  5. Passionate Eng

    B Work done by magnetic force

    If magnetic force does not exert work on moving charges, how could a current loop immersed in a magnetic field rotate and how could a magnet attract or repel another one?
  6. Passionate Eng

    I Spooky electrons...

    I don't know too much about it. And I think the presenter is trusted and the documentary was broadcast on the BBC. you think this information are wrong?
  7. Passionate Eng

    I Spooky electrons...

    I watched a documentary about Quantum mechanics. There's a phenomenon which Einstien called "spooky action at a distance" states that two electrons appeared in the same event are related to each other in a spooky way,which means that if one of them has a specific state then the other one will...
  8. Passionate Eng

    Power and frequency

    If I have tow sinusoidal voltage sources, one with 50Hz frequency and the other with 60Hz. which one of them will deliver more power if connected to 1 ohm resistor?
  9. Passionate Eng

    Heater resistor

    if I heat a resistor, it will reach a specific temperature and keep it. because as temperature increases the resistance decreases, so reducing the power absorbed. is that true? and how to calculate how much current and voltage I have to deliver to reach a specific temperature?
  10. Passionate Eng

    A Randomness vs chaos...

    The universe is random or chaotic?
  11. Passionate Eng

    Object oriented programming

    Why do we use the interface?
  12. Passionate Eng

    Object oriented programming

    sorry, i want java program
  13. Passionate Eng

    Object oriented programming

    I have a problem with understanding the concepts of "object oriented programming" I do not know what is an instance, object, method,interface... I have read many examples from the real world but I need a sample code with labeled instance, object, method, interface I wish the idea is clear
  14. Passionate Eng

    Synchronous motor

    how is the back emf affected by the flux of the rotor? I know the relation : Ea=k*phi*w but i need a physical explanation
  15. Passionate Eng

    Transformer efficiency

    hello there i have some confusion about transformer efficiency when it is max? and how it is calculated in different loading conditions e.g. at 80% of full load or at given PF
  16. Passionate Eng

    B Why waves of light don't hit each other?

    ___________ then, how could photoelectric phenomenon be explained?
  17. Passionate Eng

    Power and Resistance

    find the equivalent of each parallel combination to reduce the circuit to a single mesh the resultant of (10,5,20) will be less than 5 so it will absorb the least amount of power (90,90)--> 45, the most amount. ______________________________ "parallel circuits take more energy than series" you...
  18. Passionate Eng

    I Dual nature

    Light can act like a wave or a particle ,depending on why? when two photons intersect they must collide since they are particles but rays independence tells they won't
  19. Passionate Eng

    Kirchoff's Loop Rule Involving 2 Resistors and a Capacitor

    R is the parallel combination of R1 and R2
  20. Passionate Eng

    Kirchoff's Loop Rule Involving 2 Resistors and a Capacitor

    Vc(t)=Forced response + Transient response forced response"steady state response" is found at time equals infinity at which the capacitor becomes open circuit here it is : 12*(2/3)=8 volts .... voltage division ____________ transient response (after solving a differential equation) is ...
  21. Passionate Eng

    Magnetic beakdown

    In a ferromagnetic core of a transformer why could breakdown happen if we reach "over_saturation" in other words: magnetic flux could make breakdown in some material just like electric current how does that happen?
  22. Passionate Eng

    Light speed

    well but I have another question about light red things absorb all colors and reflect red green absorb all and reflect green ,and so on why do they do this?
  23. Passionate Eng

    Light speed

    I thought of it in a different way but why? why the does the speed in water is less than it in vaccum?
  24. Passionate Eng

    Light speed

    can someone reduce the speed of light?
  25. Passionate Eng

    Capacitor and inductors

    Physically, can someone explain why does not the voltage on the capcitor change immediatly? and why does not the current in the inductor also do? :smile:
  26. Passionate Eng

    Complex power

    Thx for all ^_^
  27. Passionate Eng

    Complex power

    Why does a load consume reactive power? How can we produce reactive power? And what is the relationship between instantaneous power and complex power?
  28. Passionate Eng

    Electrostatic charge

    someone is my friend and he is studying civil engineering
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