Two meteoroids are heading for earth. their speeds as they cross the moon's orbit are 2.0 km/s. the first meteoroid is heading straight for earth. what is its speed of impact? . the second misses the earth by 5000 km. what is its speed at its closest point? using similar agrument, e at moon's orbit = (1/2)mv2 - gmm/r = e atthe closest point = (1/2)mv22 -gmm/(r1+r)

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) =_