A large wooden turntable of radius 2 m and total mass 120 kg is set to rotation from rest about a vertical axis through its center, with angular velocity 3.0 rad-s-1 at 4s. A bag of sand of mass 100 kg is dropped vertically onto it, at a point near the outer edge. (a) Calculate the torque applied for the rotation. (b) Find the angular velocity of the turntable after the sandbag is dropped.

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.

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?