The Incredible Mass Lifting Machine

Developing A Mass Lifting Engine Cycle

This activity showed that a heated rubber band was fine if all we wanted to do was to move a weight once. We heated the rubber band at first, and then, waited several minute. The mass dropped on the desk, and turning off the heat gun.
The Incredible Mass Lifter Engine

The engine cycle was much easier to describe if you began withe the plunger resting above the bottom of the cylinder. Thus, we suggested to raise the plunger to the 2 cc mark before inserting the rubber stopper firmly in the can. Also air does leak out of the syringe slowly. If a large mass is being lifted, the leakage rate increases, so we suggest that you use a 50 g mass. After observing a few engine cycles, we should be able able to describe each  of the point a, b, c, and d of a cycle carefully, indicating which of the transitions between points were approximately adiabatic and which were isobaric. We observe changed in the volume of  the gas directly.

In the point a and point b, the flask put in the cold water, and from a to b, a mass set in the plunger to make the pressure become larger, and the volume of cylinder with trapped air became small. In the point c, the flash put in the hot water, the pressure became larger than point b, and the volume if cylinder with trapped air was larger than point a. In the point d, we took out the mass, the pressure returned the original pressure, and the the volume of cylinder with trapped air was lager than point c.

This picture showed the graph of the activity.

A Theoretical Analysis of A Heat Engine Cycle

A cycle made up of changed in volume made under constant pressure and changed in pressure made under constant volume.The gas has an initial pressure of 1.02*10^5 N/m^2, and an initial volume of 0.08 m^3. At first part, the hot water transfer just enough heat energy to the gas so that it expanded at constant pressure and did work on its surroundings until it had reached a volume of 0.1 m^3. Then, the gas was placed in the cold reservoir again and was cooled at a constant volume of 0.1 m^3, and the gas transfer heat energy to the ice water until its pressure decreased to 0.79*10^5 N/m^2. Next, we removed the collar and let gas cool further. At the same time, we kept the gas at a lower constant pressure while its volume was reduced the original. Finally, we made the pressure on the gas to rise to its original and returned the first part.

This picture showed the graph of the who activity and evaluate the change in internal energy for the whole parts of the cycle.