February 19, 2017

Homework Help: physics homework

Posted by dawn on Tuesday, October 16, 2007 at 8:06pm.

can you please check my answers?

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?
-The reel is the left and it speeds up because of its greater rotational intertia is near the rim.

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?
-is it because their center mass is is fixed, but different.

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?
-would it be linear momentum.

34. when a car drives off a cliff, why does it rotate forward as it falls? (consider the torque it experiences as it rolls off the cliff)?
-I don't understand this question

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