Question

a system inputs 100 units of energy and outputs 70 units of energy. where does the other 30 units of energy go? back into the system as water; into the environment as stored energy; into the environment as heat, sound, or light

Explanation:

In energy systems, energy is never created or destroyed (Law of Conservation of Energy), but it can be transformed or dissipated. When a system has energy input and less output, the "lost" energy (here 30 units) is typically dissipated into the environment as non - useful forms like heat, sound, or light due to inefficiencies (e.g., friction, electrical resistance). The option "back into the system as water" is incorrect as water isn't a typical form of energy return in this context. "Into the environment as stored energy" is also incorrect because the unaccounted energy here is dissipated, not stored in a way that's relevant to this energy loss scenario.

Answer:

into the environment as heat, sound, or light