MEDIUM 1 - water balloons 1. What are the characteristics of this medium? 2. Wha
ID: 1626612 • Letter: M
Question
MEDIUM 1 - water balloons 1. What are the characteristics of this medium? 2. What would happen to your hand when holding water balloon after the balloon was struck with a hammer? (assume it does not break) 3. Is this medium good for energy propagation, prove it through supporting references. (pg number) MEDIUM 2 - hard baseballs 1. What are the characteristics of this medium? 2. What would happen to your hand when holding a baseball after being struck with a hammer? Did you feel more pressure when compared to the water balloon? why? 3. Is this medium good for energy propagation, prove it through supporting references. Part II If stiffness of the medium increases and the time remains unchanged, what happens to the distance? If the compressibility of the medium decreases and distance remains unchanged, what happens to the time? If the bulk modulus decreases and all other factors remain the same, what happens to the velocity? If the density decreases and all other factors remain the same, what happens to the velocity? If stiffness decreases and time decreases, what happens to the distance?
Explanation / Answer
Sol:
1. It is a solid substance with density close to that of wood or plastic; it is highly elastic, but not very compressible. Bulk modulus - look it up (for plastic or wood), I don't remember off hand. It has to be pretty high, so that the ball doesn't get smashed whe you strike it.
2. Your hand would feel as if you struk it with a hammer, i.e. pain and unpleasantness. The collisison between hammer and baseball is absolutely elastic, that's why. Oh yeah, you'd feel tons more pressure compared to the water balloons. Cause collision with water balloons would be inelastic. ballons change their shape easlily and absorb the energy of the impact into the internal energy of its molecules.
3. Yes, this medium is good for energy propagation. (whatever they mean by this statement) which is supported by (2).
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