The motion of a particle executing simple harmonic motion is described by the displacement function, x(t) = A cos(wt + Q) If the initial (t = 0) position of the particle is 1 cm and its initial velocity is c cm/s. Find a) The wave amplitude

and b) The wave initial phase angle "Q"

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u. s. legal proceeding.)

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons