17. Free Response. A 0.40-kilogram mass is sliding on a horizontal, frictionless air track with a speed of 5.0 meters per second when it instantaneously hits and sticks to a 2.3-kilogram mass initially at rest on the track. The 2.3-kilogram mass
is connected to one end of a massless spring at the springs unstretched compressed position (equilibrium), which has a
spring constant of 100 newtons per meter. The other end of the spring is fixed to a wall.
Determine the following for the 0.40-kilogram mass immediately before the impact.
į. Its linear momentum
ii. Its kinetic energy
a.

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. what is its vertical displacement (in m) after 6 s?

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.

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?