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?

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)