Explain why common “contact forces” such as a person pushing on a wall are actually caused by the electric force. In your answer, you must discuss the role of subatomic particles in this interaction, whether the atoms in the person’s hand and the wall come into contact or not

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.