The next two questions are related: 16. an electron is confined in a 3-dimensional rectangular box (v = 0 inside, and v = 8outside) with sides l = 4 nm, 4 nm, and 5 nm. what minimum energy, e_, must a photon havein order to excite the electron out of its ground state. (the electron absorbs the photon.)a. e_ = 0.015 evb. e_ = 0.045 evc. e_ = 0.071 evd. e_ = 0.125 eve. e_ = 0.241 ev17. now we put 10 electrons into the box. assuming the total energy of the system is as low aspossible, and including the effects of spin, how many electrons have the energy of the secondexcited state? a. noneb. 1c. 2d. 4e. all 10

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)