8. in order to find the capacitor current phase we would need a device that measures current versus time. fortunately, we know that the phase difference between the voltage and current in a resistor is 0o. so for the series capacitor and resistor if we measure the resistor voltage phase it will have the same phase as the capacitor (and total) current. reverse the positions of the resistor and capacitor and measure the phase shift between the source and the resistor voltage. remember to adjust the amplitude to 1 vrms for each measurement.

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.