A stationary 19 kg object is located on a table near the surface of the earth. The coefficient of static friction between the surfaces is 0.30 and the coefficient of kinetic friction is 0.12.
A horizontal force of 67 N is applied to the object.
Step1: Find Static Friction
Step2: Find Kinetic Friction
Step3: Find Applied force
Step 4: is it balanced or unbalanced? How do you know?
Step 5: find acceleration (A = Fapp - Force of Kinetic Friction /M)

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.

Give an example in which the electrical energy changes to light energy

When measuring volume, why is it important to use the correct tools and units to attain the greatest accuracy? use specific examples from the lab to support your answer. (5 points)