a test car travels in a straight line along the x axis. the graph in the figure shows the cars position x as a function of time. find the instantaneous velocity at point b

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present