1. A 20m steel wire is stretched to 20.0m by

the application of a force of 50N. What force

should be applied to stretch the wire to become

20.05m within its elastic limits?

A. 50 N

B. 100 N

C. 250 N

D. 40,000 N

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) =_