Question

I went back through my book again to find the answers can you check them?

10. when rewinding a an audio tape or vdieotape, one reel winds fastest at the end. which reel is this? why does it speed up? (this one I understand. I think that it has something to do with rotational intertia or tangential speed, not too sure)

15.the wheels of railroad trains are tapered, a feature especailly important on curves. how if at all does the amount of taper relate to the curving of the tracks? (this question I don't understand)

20. flamingos are frequently seen standing on one leg with the other lifted. what can you say about the birds center of mass with respect to the foot on which it stands?
-because their center of gravity lies above its base of the support, therefore it is more stable

23. the front wheels located far out in front of the racing vehicle help to keep the vehicle from nosing upward when it accelerates. What physics concepts play a role here?
-centrifugal force