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7nadin3 [17]
3 years ago
13

Mosses don't spread by dispersing seeds; they disperse tiny spores. The spores are so small that they will stay aloft and move w

ith the wind, but getting them to be windborne requires the moss to shoot the spores upward. Some species do this by using a spore-containing capsule that dries out and shrinks. The pressure of the air trapped inside the capsule increases. At a certain point, the capsule pops, and a stream of spores is ejected upward at 3.6 m/sm/s, reaching an ultimate height of 20 cm.
Required:
What fraction of the initial kinetic energy is converted to the final potential energy?
Physics
1 answer:
Bogdan [553]3 years ago
5 0

Answer:

  U / K = 0.30

Explanation:

For this exercise we must calculate the energy at the two points.

Initial. Where are the spores

       K = ½ m v²2

Final. Higher

        U = m g h

the fraction of energy is

          U / K = 2gh /v²

let's calculate

           U / K = 2  9.8  0.20 / 3.6²

            U / K = 0.30

therefore 30% of the energy is lost

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