Atoy car having mass m = 1.10 kg collides inelastically with a toy train of mass m = 3.55 kg. before the collision, the toy train is moving in the positive x-direction with a velocity of vi = 2.20 m/s and the toy car is also moving in the positive x-direction with a velocity of vi = 4.95 m/s. immediately after the collision, the toy car is observed moving in the positive x-direction with a velocity of 1.80 m/s.

(a) determine the final velocity of the toy train. cm/s
(b) determine the change ake in the total kinetic energy.

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

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.

Rohit is trying to tune an instrument