Two masses m 1 and m 2 move i n a plane and interact by a potential energy U (r) = f kr 2 • Write down their Lagrangian in terms of the CM and relative positions R and r , and find the equations of motion for the coordinates X, Y and x, y. Describe the motion and find the frequency of the relative motion.

What properties of a moving object are used in determining the object's energy of motion

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?