1. E

    Constant Volume System

    I keep seeing various variations of this problem in different thermodynamics problem sets: A closed system of constant volume experiences a temperature rise of 25oC when acertain process occurs. The heat transferred in the process is 30kJ. The specific heat at constant volume for the pure...
  2. P

    Gravitational constant visualized

    Ive recently learned about the gravitational constant. Although i am having a hard time visualizing what this actually means. I have always been stubborn in the fact that i cant just accept and idea or theory without really digging deep and understanding it on a fundamental level. I understand...
  3. V

    Harmonic motion with spring moving with constant speed

    A spring whose constant is $k$ has its left end joined to a mass $m$ while its other end is always moving whith constant speed $u$. The coefficient of kinetic friction between the mass and the horizontal surface is μ and the coefficient of static friction is 2μ. The mass can carry out harmonic...
  4. L

    The potential energy of born rigid body is a constant ?

    \ \ \ \ \ The sum of rest masses of a born rigid body consists of two parts: the potential energy of a born rigid body, and the actual particles or the material in the form of physical existence. \ \ \ \ \ For a born rigid body, there is no conversion between matter and energy. The actual...
  5. O

    The cable resistence constant with the temperature

    I am confused with this question, difficult to find steps to solve it. A carbon cable and a tungsten cables are connected each and made a cable. The resistivity of tungsten is 5.6*10^-8Ωm and carbon is 3.5*10^-5Ωm. The temperature coefficient of resistivity ,tungsten=0.0045°C-1 and...
  6. M

    Why the cost per unit of exergy of the working fluid in a turbine keep constant?

    Why the cost per unit of exergy of the working fluid in a turbine remains constant? Dear all, Why the cost per unit of exergy of the working fluid in a turbine remains constant? thanks
  7. L

    Newton's constant

    How did Cavendish obtain Newton's constant?
  8. L

    Electrostatic Coulomb Constant

    Hi, I'm sorry if this ends up being a duplicate, but I don't think the post I submited yesterday actually went through. I'm having an insane amount of difficulty figuring out how the electrostatic coulomb constant: a<coul>=3/5*ke^2/r<0> can equal around 0.8MeV. With the...
  9. E

    Is Planck's constant & light speed the "boundary" of the cosmos?

    Hullo-- I read this book by Christopher Bek (Philosophymagazine), The Theory of One: realizing the dream of a final theory (2015). It's core, which the author says he deliberately Occam-ized it to the maximum (leaving the mathematics for later), is this: P1: There is no causality...
  10. avito009

    What if mass is not constant?

    When we use the formula L= mxvxr. We usually hold mass to be constant. For example when the Earth orbits the Sun the r which is the separation distance gets smaller so to compensate and for conservation of angular momentum to be true the velocity should increase but mass is supposed to be...
  11. pittsburghjoe

    Is the speed of light constant even in observed vs unobserved settings?

    Does an observed photon hit the last panel quicker in the Double Slit experiment than one without a detector?
  12. J

    boundary layer and constant flow

    Hola, Because in the laboratory only have teste area of 2 m, I would like to know if there are equations that relate the results of a constant flow with a boundary layer.tks
  13. C

    Time elapsed under constant accel

    Working on relativity problem from textbook. Derived time transformation for elapsed time while under constant acceleration a=g, starting from rest, with time and space synchronized for two reference frames t0=t0'=0 x0=x0'=0. Earth frame is S, ship's frame is S'. My result is t = (c/g)...
  14. R

    Constant volume cooling

    Hello everyone, I solved a question but having no answer sheet I am not completely sure if what I did is correct. Problem: 5 kg of CO2 at its critical state is placed in a perfectly rigid container, which is then cooled until the temperature is 260 K. - What is the volume occupied by liquid...
  15. C

    Showing lim of v is c when constant F accelerates particle

    Problem from textbook reads: "A particle with mass m accelerated from rest by a constant force F will, according to Newtonian mechanics, continue to accelerate without bound. That is, as t goes to infinity, v goes to infinity. Show that, according to relativistic mechanics, the particle's speed...
  16. A

    Need help with spring constant experiment

    Hello everyone, I am doing an experiment titled 'mass on a spiral spring' in order to find the value for the acceleration due to gravity in the first part of this experiment, I just measured the oscillation period of a spring as a suspended mass and plotted these results onto a graph to find...
  17. topsquark

    Units and the fine structure constant

    I'm (still) working through the Dirac equation solution for the hydrogen atom and I've run across a problem. Apparently I'm working in a system of units where the fine structure constant is equal to 1, not the usual 1/137. I know that (hbar) = c = 1 and that k = 1/(4 (pi) (epsilon)_0) = 1...
  18. R

    electric constant of a capacitator assignment question

    A parallel plate capacitor has a capacitance of 1.5µF with air between the plates. The capacitor is connected a 12V battery and charged. The battery is then removed. When a dielectric is placed between the plates, a potential difference of 5.0V is measured across the plates. What is the...
  19. N

    Force/Velocity of a spring

    A spring with a force constant of 350 N/m is compressed 12 cm by a 3.0 kg mass. How fast is the mass moving after only 10 cm of the spring is released?
  20. S

    constant level oiler

    How does a constant level oiler work supplying a pump system via a gravity fed reservoir? How does the pump maintain a constant level of oil in its reservoir? Is it because when its full it has a pressure exterted which the gravity fed oiler cannot overcome.