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?

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Which of the following is an example of motion in two dimensions?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?