PLEASE I NEED HELP A swimming pool is an example of an open system. According to the law of conservation of energy, if swimmers add 12,000 J of thermal energy and the surrounding air removes 8,500 J of thermal energy, what is the total change in energy? A. A decrease of 8,500 J
B. A decrease of 3,500 J
C. An increase of 3,500 J
D. An increase of 20,500

An increase of 3,500 J

Explanation:

Given that,

Energy added by swimmer = 12000 J

Heat removed by the surrounding = 8500 J

We need to find the total change in energy. It can be calculated using the law of conservation of energy such as :

As the change in energy is positive, it means that there is an increase of 3500 J.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.