In which of the situations listed below is energy being transferred as heat to the system in order for the system to do work? In which situation is work being done on the system in order for energy to be transferred from the system as heat?

a. Two sticks are rubbed together to start a fire.
b. A firecracker explodes.
c. A red-hot iron bar is set aside to cool.
B and C?

2. Identify the following processes as isothermal, isovolumetric, or adiabatic:
a. a tire being rapidly inflated
isovolumetric
b. a tire expanding gradually with heating
isothermal
c. a tire being heated while in a rigid metal container
adiabatic

In the first situation, where a firecracker explodes, energy is being transferred as heat to the system in order for the system to do work. This is because the explosion of a firecracker is a result of the rapid release of energy in the form of heat.

In the third situation, where a red-hot iron bar is set aside to cool, work is being done on the system in order for energy to be transferred from the system as heat. This is because when the iron bar is set aside, the surroundings are at a lower temperature, causing the heat energy to transfer from the iron bar to the surroundings.

Regarding the second question, the identification of the processes is as follows:

a. When a tire is rapidly inflated, the process is isovolumetric. This means that the volume of the gas inside the tire remains constant while the pressure and temperature change.

b. When a tire expands gradually with heating, the process is isothermal. This means that the temperature of the gas inside the tire remains constant while the volume and pressure change.

c. When a tire is being heated while in a rigid metal container, the process is adiabatic. This means that there is no exchange of heat between the tire and its surroundings, and only work is done on the system, resulting in a change in temperature and pressure.