Far out in space, a 100,000-kg rocket and a 200,000-kg rocket are docked at opposite ends of a motionless 90m-long tunnel. the tunnel is rigid and has much less mass than the rockets. the rockets start their engines simultaneously, each providing 50,000n of constant thrust in opposite directions. a. find the center of mass, as measured from rocket 1b. what is the moment of inertia of the system, assuming the rockets can be treated as point masses? c. find the net torque on the system about the center of massd. what is the angular acceleration of the system? e. what is the structure's angular velocity after 30.0 seconds?

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 necleus of an atom is made up of what subatomic particles?

What causes the development of most clouds and precipitation in the atmosphere?