This is a challenging problem. solve it on paper, writing out each step carefully. when doing calculations, do not round intermediate values. note: if you have approached the problem in a principled way, do not abandon your approach if your numerical answer is not accepted; check your calculations! a particle with mass and charge and its antiparticle (same mass , charge ) are initially at rest, far from each other. they attract each other and move toward each other. (c) if instead, when the particles were far from each other, they were not at rest, but were moving toward each other with the same nonzero speed, which of the diagrams in part (a) would correctly show the energy of this system as a function of separation?

Two horizontal plates with infinite length and width are separated by a distance h in the z direction. the bottom plate is moving at a velocity u. the incompressible fluid trapped between the plates is moving in the positive x-direction with the bottom plate. align gravity with positive z. assume that the flow is fully-developed and laminar. if the systems operates at steady state and the pressure gradient in x-direction can be ignored, do the following: 1. sketch your system 2. identify the coordinate system to be used. 3. show your coordinates and origin point on the sketch. list all your assumptions. 5. apply the continuity equation to your system. nts of navier stokes equations of choice to your system 7. solve the resulting differential equation to obtain the velocity profile within the system make sure to list your boundary conditions. check units of velocity 8. describe the velocity profile you obtain using engineering terminology. sketch that on the same sketch you provided in (1). 9. obtain the equation that describes the volumetric flow rate in the system. check the units.

Most of the volume of an atom is occupied by the

Photons with the highest energy have the longest period