Spinning a marshmallow over a fire is effective maybe if you hang it over the fire and heat it up equally on each side
Since momentum is a vector quantity, take any direction as positive and other as negative. Answer won't change.
Starting making jokes and rapping
Answer:
Along path BC of the Otto cycle, heat transfer Qh into the gas occurs at constant volume, causing a further increase in pressure and temperature. This process corresponds to burning fuel in an internal combustion engine, and takes place so rapidly that the volume is nearly constant.