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
I'd be happy to help you check your answers and provide explanations where needed. Here's a breakdown of each question:
10. When rewinding an audio tape or videocassette, the reel that winds the fastest at the end is the take-up reel. This happens because of the principle of rotational inertia. As the tape is being wound onto the take-up reel, the radius of the tape on the reel decreases, which causes an increase in tangential speed. This increase in tangential speed leads to the take-up reel winding faster.
15. The taper on the wheels of railroad trains is specifically designed to compensate for the curving of the tracks. The amount of taper relates to the curving of the tracks in the sense that it helps ensure a smooth and stable movement of the train around curves. The tapering of the wheels allows the outer wheel to roll a slightly longer distance than the inner wheel when going around a curve. This helps to minimize sliding or skidding of the wheels and ensures proper contact with the rails.
20. The fact that flamingos are frequently seen standing on one leg with the other lifted demonstrates the principle of stability and the concept of the center of mass. The bird's center of mass lies above the base of support, which is the foot on which it stands. This positioning of the center of mass provides better stability, making it easier for the flamingo to balance on a single leg without falling over.
23. The presence of front wheels located far out in front of a racing vehicle helps prevent it from nosing upward when it accelerates. The physics concept at play here is not centrifugal force, but rather the concept of torque. The arrangement of the front wheels creates a torque that counteracts the upward rotation caused by the acceleration. This helps maintain the stability and control of the vehicle, preventing it from tilting or lifting off the ground.