A quarry truck has a loaded mass of 150 t and is powered by a hydraulic circuit (conceptually, a diesel motor connected to a hydraulic pump are connected to a motor in each wheel hub. Each motor has volumetric and mechanical efficiencies of 0.9 and 0.92, respectively, and the pump has volumetric and mechanical efficiencies of 0.93 and 0.96, respectively.

The truck has 2.5 m diameter tyres and 4 motor wheels, with the load on each wheel approximately constant. The truck, by design, can drive fully loaded on a slope of 30 degrees at 30 km/h.

Calculate:

- The net useful power of the truck (required power at wheels);

- The torque in each wheel;

- The flow of oil for each motor at 30 km/h on a 30 degrees slope assuming a circuit pressure of 400 bar;

- The net power of the Diesel engine;