One elevator arrangement includes the passenger car, a counterweight, and two large pulleys, as shown in FIGURE 11-50. Each pulley has a radius of 1.2 m and a moment of inertia of 380 kg ∙ m2. The top pulley is driven by a motor. The elevator car plus passengers has a mass of 3100 kg, and the counterweight has a mass of 2700 kg. If the motor is to accelerate the elevator car upward at 1.8 m/s2, how much torque must it generate? Hint: The two pulleys move together, so you can model them as a single pulley with the sum of the moments of inertia.

-Pulley Electric motor Passenger car Counterweight Pulley