A person pushes a 27.4 kg car at a constant velocity of 17.1 m/s across a horizontal floor for 78.3 s. Find the energy dissipated by the
frictional force ?
(given that the coefficient of kinetic friction Hk = 0.4)
V
friction opposing the motion
Fk
Energy =

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?