Physics, 03.07.2019 13:30 sindy35111
Achild on roller skates pushes off against the wall with a force of 40n. how far must the child push themselves away from the wall (starting from rest), so that his final kinetic energy is 275j?
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Physics, 22.06.2019 07:30
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.
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Physics, 22.06.2019 11:00
What is the measurement of how fast an object moves relative to a reference point?
Answers: 1
Physics, 22.06.2019 15:00
Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost
Answers: 1
Achild on roller skates pushes off against the wall with a force of 40n. how far must the child push...
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