Measurement of the H line in the spectrum of the halo star HD 19445 reveals a wavelength of 656.586 nm compared to the rest wavelength of 656.281 nm. What is the radial velocity of HD 19445 in km/s? (answer down to one decimal place and include your +/- sign; do NOT include the units in your answer

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) =_