We use Padmabhan's "Invitation to Astrophysics" formalism of a scalar field evolution of the early universe, from first principles, to show something which seems counter intuitive. How could, just before inflation, kinetic energy be larger than potential energy in pre-Planckian physics, and what...
You can find the velocity of the mass by differentiating wrt in equation (1). Then you can expand and simplify to obtaing a pretty nice expression for . The resulting total kinetic energy is quite simple. I did not bother to try to separate the kinetic energy into radial and tangential ...
How much energy would be generated if a physics student (mass = 62 kg) could be completely turned into energy? Potential energy that depends on height is called How do you calculate the power expended to accelerate if the change in kinetic energy is 4356 J during a time interval of 6.58 ...
In Physics, the law of conservation of energy states thatenergy can neither be created nor be destroyed. This means that in order togenerate electricity, another kind of energy should be used as fuel. Thomas Seebeck (1770-1831): Discovered the “Seebeck Effect“. Michael Faraday (1791-1867):...
Nearly all of our cellshave the ability to generate electricity. And in this article, we'll look at the role of electricity in the human body and find out how we produce it in the first place. The starting point is simple: Right now, any cells in your body that aren't actively sendi...
Get ready to add this simple rubber band car project to your STEM activities this season. If you want to find out how a rubber band car works and how to make your own, read on! While you’re at it, make sure to check out other fun physics activities. MY LATEST VIDEOS This video ...
In physics terms, the volume of the cylinder is related to how much work the fuel does as it expands, how much energy it transfers to the piston, and (if we consider how often this happens), how much power the car makes. So the bore and stroke are very important—and that's why ...
Heat is one of the seemingly countless forms of the quantity known as energy in physics. Energy has units of force times distance, or newton-meters, but this is usually called the joule (J). In some applications, the calorie, equal to 4.18 J, is the standard unit; in still others, th...
It's easy to find examples of both potential energy and kinetic energy in the world around us. If you push a boulder up a hill, you'll find it's a real effort to get to the top. This is because the force of gravity is constantly trying to pull you (and the boulder) back down....
Once we know it, we can rearrange to find the other two.Examples of Working Out Watts, Amps and Volts for Appliances How to Work Out Watts Watts = Volts x Amps e.g. A 120 volt appliance takes 2 amps, what is the power?Power in watts = 120 x 2 = 240 watts...