Micah is investigating the transformation between potential and kinetic energy within a system. he uses a swinging pendulum in his investigation. he records his observations of the pendulum at different positions and creates the table below.

kinetic and potential energy of a pendulum

position kinetic energy (joules) potential energy (joules)

1 0 50

2 25 25

3 50 0

4 25 25

5 0 50

which statement best describes the energy transformation in michah's investigation?

the total energy of the system is maintained as energy is transformed.

the total energy of the system increases as kinetic energy is created.

the total energy of the system decreases as potential energy is destroyed.

the total energy of the system changes as energy is added to it.

3. consider a process in which a gas with the properties of air expands at constant pressure as described by the cups of air discussion in class. one kilogram of air starts out at 1 atm and 290 k. the air expands its volume by absorbing a sufficient amount of thermal energy to increase the temperature at constant pressure to 350 k. a. on a p-v diagram, sketch this process with point a as the starting point and point b as the ending point. b. if the process is completely reversible, calculate the thermal energy added from an external source. c. calculate the entropy change for this process assuming it is reversible. d. calculate the work delivered externally if this is a reversible process. e. if the process is completely irreversible, calculate the amount of entropy change for the process that is due to irreversibilities. f. if the process is completely irreversible, calculate the amount of thermal energy added from an external source and compare this result to the thermal energy calculated in part b. g. for the completely irreversible process, calculate the entropy change due to this thermal energy addition. h. for the completely irreversible process, calculate the total entropy change and compare it to the entropy change in part c.