What is it called when air pressure at sea level is 101.3

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What’s #16 asking me and how do i solve it?

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) =_