A 100 N crate is being pushed across a level floor at a constant speed by a force F = 300 N at an angle of 20.0° below the horizontal, as shown in the figure below. What is the coefficient of kinetic friction between the crate and the floor?

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?