Your motor has a stall torque of 6.25 kg-cm and a no load speed of 1250 rpm. your operating point for your application is to spin with a speed of 400 rpm with a torque of approximately 1.75 kg-cm. you do not have a gearbox or any other way of introducing mechanical advantage. what should your pwm duty cycle be for this motor and operating point?

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?