A gasoline-powered engine follows the pV trajectory shown in the figure below. Calculate the i) useful work (W_out), ii) heat extracted from the hot reservoir (Q_H), and iii) thermal efficiency (η).

A heat engine undergoes a cyclic process consisting of three steps: AB, BC, and CA. The engine utilizes 1 mol of helium as its working fluid. Calculate the net change in internal energy, the net work done by the engine, and the net heat exchanged by the engine during one cycle.

The dynamo on a bicycle generates electricity as we pedal. The dynamo has a per-cycle work output of 50 J and waste heat output of 80 J. Determine the dynamo's thermal efficiency during your bike ride.

A motorbike has an engine with an output power of 15 horsepower and a rotational speed of 3600 rpm. Assume that the engine operates in a closed cycle and has a thermal efficiency of 25%. Calculate the engine's i) work and ii) heat output in one cycle.

A mechanical engineer designed a thermal engine that operates using the cycle shown in the figure below. Determine i) the heat extracted (Q_H) from the heat source ii) and the thermal efficiency (η)

A 1200 W portable power plant runs on liquid petroleum. The power plant consumes 0.50 L of liquid petroleum per hour. The energy density per volume unit of the used liquid petroleum is 35 MJ/L. Calculate the thermal efficiency of this power plant.

A thermal engine undergoes a cyclic process that consists of three steps and utilizes 1.5 mol of neon gas as its operating fluid. The engine's pV diagram is given below. Determine the engine's efficiency.