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  1. C

    How can you move a wheel chair sitting on it?

    This makes me think about another problem that is sort of interesting. A child on a swing. How does the child get the swing going higher and higher when there is nobody pushing him?
  2. C

    What is this formula for?/What is it called?

    You are on the right track, I see it as torque = (moment of inertia) x angular acceleration. S is force, r is radius, 1/2 m rsq is moment of inertia, and a is linear acceleration, a/r is angular acceleration.