TASK DEFINITION: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
PROBLEM: Question: What can be used to convert the energy provided by the sun to usable electrical energy? Answer: solar cells

SOLUTION: Solar cells convert the energy in sunlight to electrical energy. They contain a material such as silicon that absorbs light energy and gives off electrons.

PROBLEM: Question: What is the vector sum of all the torques acting on the object called? Answer: net torque

SOLUTION: The net torque is the vector sum of all the torques acting on the object. When adding torques it is necessary to subtract CW from CCW torques.

PROBLEM: Question: In an acidic medium, add which ions to balance? Answer: hydrogen

SOLUTION:
Now the hydrogen atoms need to be balanced. In an acidic medium, add hydrogen ions to balance . In this example, fourteen H + ions will be added to the reactant side.