12. A sprinter has an acceleration of 5m/s” during the first 2 seconds of the race. What velocity does she reach after this time?

What is work? how much work is done to move an object 0 meters?

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) =_

If you put a helium-filled balloon in the refrigerator, what will happen?