A heat engine is a device that converts thermal energy into ordered energy as heat flows from a hot object to a cold object. Because heat flowing from the hot object to the cold object increases the overall entropy of the system, a small amount of thermal energy can be converted into work without decreasing the system s overall entropy or violating the second law of thermodynamics. This is what happens in the atmosphere. A lawnmower uses a one cylinder, two-stroke engine that combines the power stroke with the induction stroke and the compression stroke with the exhaust stroke. Explain why this engine won t run smoothly unless it s attached to the mower s massive cutting blade and can exchange energy and angular momentum with the blade.
Energy is required to move the components of the engine.
In an engine with multiple cylinders, some of the energy from the explosion in one cylinder is used to provide energy to the other cylinders. The angular momentum of the blade provides this energy to operate the cylinder until the next combustion. The higher temperature means that the engine is hotter and the pressure is greater, which means that the fuel-air mixture will ignite prematurely. Case 3, page 317. On a sunny morning at the seashore, the sun warms the land quickly while the sea remains cool.