Two particles d and b. of mass in and 3m respectively. are connected by a light inextensible string of length 7. particle a is placed on a horizontal table at a perpendicular distance / from its edge, the coefficient of friction between particle a and the table being 1/3. particle b, which is at the edge of the table, is just pushed over the edge and subsequently falls under the action of gravity and the tension in the string, assuming that there is no friction between the string and the table, show that the speed of 4 when it reaches the table edge is 2 (81/3). find also the time taken by particle to reach the edge of the table and the tension in the string while a is moving on the table.

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?

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.