Conservation of momentum in a situation with men jumping off a flatcar. - N men, each with mass, m, stand on a railway flatcar of mass, M. They jump off one end of the flatcar with velocity u relative to the car. The car rolls in the opposite direction without friction. a) What is the final velocity of the flatcar if all the men jump at the same time? b) What is the final velocity of the f...

Torque, center of mass - The masses of the Earth and Moon are 5.98 x 10^24kg and 7.35 x 10²²kg, respectively, and their centers are separated by 3.84 x 10^8 m. (a) where is the CM of this system located? (b) what can you say about the motion of the Earth-Moon system around the sun, and of the Earth and Moon separately around the Sun? *note- please explain this in the simplest terms possib...

Wave Function - 1. A particle moving in one dimension between two rigid walls, (movement is perpendicular to the walls), separated by a distance L has the wave function: A*sin(Pi*x/L) Since the particle must remain between the walls what is the value of A? 2. A neutron has a Kinetic Energy of 10MeV. a) what size object is object is necessary to observe neutron diffraction effec...

What is the thickness of the potential barrier? - I have a test coming up and I was told I have to be able to work out a problem like this: An electron with E= 1.2 eV has a probability of 10-4 for tunneling through a potential barrier with a height of 2.4 eV. What is the thickness of the potential barrier?

What minimum barrier thickness is there no reflection? - I have a test coming up and I was told I need to know how to work out a problem like this: Suppose electrons with E= 13.0 eV approach a potential barrier of height 6.0 eV. For what minimum barrier thickness is there no reflection? For what minimum barrier thickness is the reflection a maximum?