Recent content by expscv

  1. E

    What Are the Energy Changes in Mobile Phones and Televisions?

    umm interesting so for tv the digtal or anologo data from source (e.g tape, cd dvd ) is converted into eletric pulese , then our tv broadcast station converted electric plues into em-radiation then goes to reciever...and the goes (skiped the Cathode Ray Tube part which produce the image...
  2. E

    What Are the Energy Changes in Mobile Phones and Televisions?

    i was being ask to describe the energy changes involved in the use of mobile phones and a television i m noot even sure i have fully understand the question, energy change? say in mobile phone, all i can think of is signal wave turns to electric pulse which then changes into...
  3. E

    Undergrad Solve Exponential Function x for y: x = (e^y-e^{-y})/2

    cool thanks for the hint and the answer
  4. E

    Undergrad Solve Exponential Function x for y: x = (e^y-e^{-y})/2

    solve x =(e^y-e^{-y})/2 for y in terms of x i kinda forgot how to do it~~~sign any help appreciated thx could anyone move this to homework k-12 section thanks sorry about this
  5. E

    High School Need Help with HS Physics Problem? Calculate Total Distance Traveled

    lol becareful distance and displacement displacement is a vector
  6. E

    High School Wave-Particle Duality: 20th Century Evidence

    ic ic thanks also from ""the thinker" that usually wave as particle collides when at high frequency, such as gamma ray =)
  7. E

    High School Wave-Particle Duality: 20th Century Evidence

    scitensit in 20th centry suggest that wave can behaviour like a particle and particle can behave like a wave for first propose wave can behave like a particle but does it ever collide? e.g photons
  8. E

    Undergrad What else Albert Einstein's contributions in optic and photonics?

    quantanised energy?
  9. E

    High School Understanding Newton's Third Law: The Case of Box Pushing

    wow thanks all for correcting me in such wrong concept over a basic principle. force is force motion is motion energy is energy =)
  10. E

    High School Understanding Newton's Third Law: The Case of Box Pushing

    lol yes true , but there is a limit, over the limit (in ur case the friction of box to the ground) the extra froce was used for moving the box, in other case, if u tries to punch a wall, the harder u punch , the more you hurt, why? the more force u apply in , the more force the wall apply...
  11. E

    Projectile Motion of a golf ball off a cliff

    btw projection motion are true upsidedown parabola
  12. E

    Projectile Motion of a golf ball off a cliff

    few mathmatical equation this apply tom most projection motion from ground to ground in vertical component y: accelration: -g g equal 9.8m/s2 velocity: -gt+usin(d) { g as above t=time u=intial velicty d=degree to the horizontal of projection}...
  13. E

    Undergrad The Mysterious Math of Chess: Probabilities and Possibilities

    yes the acceptable game that would ingnore a lot of moves, but ! but if say the possible of ways play chess could be infinite since checkmate or not is not include.d alternative atom have they basic principle rules, and can limit to a n possible of ways
  14. E

    What Does Nothingness Really Mean?

    empty vacuum space? with no radiation?
  15. E

    High School Confusion between kinetic energy and potential energy

    kinetic is got to do with motion ---> velocity pential energy is generally to do with gravity, which depends on the position of the mass from the centre of gravity