# constant

1. ### 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. ### 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. ### 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. ### 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. ### 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. ### 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. ### Newton's constant

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