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 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: What forces keep the moon orbiting the earth? Answer: gravitational

SOLUTION: This photograph was taken by Apollo 8 crewmember Bill Anders on December 24, 1968, showing the Earth rising above the lunar surface. Gravitational forces keep the moon orbiting the Earth.

PROBLEM: Question: Hfcs are used as a replacement for what? Answer: cfcs

SOLUTION:
HFCs are used as a replacement for CFCs. The molecular structure of HFC134a is shown in this ball-and-stick model.

