Answer:c
Explanation:
In Physics we follow the sign convention i.e. work done by the system is considered as positive i.e. work is being done by system on the surrounding and vice-versa.
For heat :Heat added to the system is considered as Positive while heat loss to surrounding is considered as negative.
thus doing work on the surrounding(work done by system) w=+
Losing heat to the surrounding q=-
The answer will be: A) Metal washers.
The answer you are looking for is Chemistry. Chemistry is the study of matter and molecules and how they change.
M/s, km/h, and mph are all used to measure these quantities
