Which was not a source of energy introduced during the late 1800s?

kerosene

steam

electricity

gasoline

Which two objects have the greatest gravitational force acting between them

Is the time in tennessee the same as florida

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 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?