Wings on race cars push them into the track. the increased normal force makes large friction forces possible. at one formula one racetrack, cars turn around a half-circle with diameter 190 m at 68 m/s. for a 610 kg vehicle, the approximate minimum static friction force to complete this turn

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 3.00 ms . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?