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1D; in A it is zero, in B and C it is the same (5 N m) and in D it is 5 2 N m.

2C, because more mass is away from the axis.

3C, masses of 2 kg separated by D.

4Point particle first, ring last. Since a=g sin θ 1+1 M R 2, the point particle has acceleration a = g sin θ, the cylinder a=2 3 g sin θ and the ring a=1 2 g sin θ.

5The angular momentum of the planet is conserved, so m v A SA=m v p SP

So, v A v r=1 3.